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Here we go again.

On Friday, Pedro Alberto Vargas, a tenant in a Hialeah, Fla., apartment building, shot and killed the building’s managers, an elderly married couple, while they served him with a complaint. Vargas, 43, then set his apartment aflame before moving from floor to floor gunning people down, including a married couple and their 17-year-old daughter, who he shot and killed while she hid in her bathtub. He also killed a man walking across the street who had just picked up his 9-year-old son from boxing practice. Vargas held two other neighbors at gunpoint for several hours before a SWAT team moved in, killing him. Police confirmed that he still had plenty of rounds of live ammunition on him. The weapon he used, a 9-millimeter Glock handgun, was purchased legally in 2010.

All told, six lives were ended at Vargas’s hand. The motive, however, remains unclear. It is the bloodiest mass murder in the city’s history.

Here is today’s report.

—Jennifer Mascia

Friday:

An 8-year-old girl was wounded after someone inside her Stockton, Calif., home fired a sawed-off shotgun belonging to her mother, who was arrested Thursday night. A 9-year-old girl was wounded after her 5-year-old brother picked up a .22-caliber rifle and accidentally shot her in the chest in Oakdale, Minn., Friday night. A 13-year-old boy is on life support after being shot by a friend in Wickenburg, Ariz., Friday night; his father had left the gun with the kids while he went shopping.

A 14-year-old boy was shot in the head and critically wounded by a homeowner who mistook him for an intruder in the Marigny neighborhood of New Orleans La., early Friday. 14-year-old Japhet Moore was killed, and a 15-year-old boy and a 22-year-old woman were seriously injured, in a shooting on the northwest side of Milwaukee, Wis., Friday night. Moore was the third 14-year-old shot there in the past week. Milwaukee experienced five separate shootings in 24 hours.

16-year-old Eugene Lohnes was shot in the back on the Spirit Lake reservation in Fargo, N.D., early Thursday. 78-year-old Nancy Ohearn was shot and killed in Kansas City, Kan., Friday night, and her son, Richard A. Ohearn, 58, has been charged with her murder. Four people were shot and killed by a man who came to collect drug money in Clarksburg, W. Va., early Friday; two of the victims were newspaper delivery boys the shooter encountered as he fled.

One person was killed and two others were hospitalized after being shot during a home invasion at an apartment complex in southwest Houston, Tex., early Friday; drugs and weapons were found at the scene. A man was shot as he sat with a woman in a parked car in north Houston late Thursday. A 21-year-old man was shot several times and wounded in the West Ward neighborhood of Easton, Pa., Thursday morning.

A San Bernardino, Calif., police officer was wounded when two people opened fire at a traffic stop Friday night. Two men were shot, one fatally, after a man walked up to a group and opened fire in the McElderry Park neighborhood of Baltimore, Md., early Friday. A man was shot and injured at the Whitcomb Court public housing complex in the East End of Richmond, Va., Friday afternoon. Justin Owensby, 31, was found dead of multiple gunshot wounds in the common area of an apartment building in the Westwood area of Cincinnati, Ohio, Friday evening.

20-year-old Markeese Hunter was shot in the back outside a South Bend, Ind., mini-mart and left in an alley Friday night, and it is unlikely he will ever walk again. A man was wounded in a shooting at the Miami Hills apartments in South Bend early Friday. 58-year-old William Menni was shot and killed after an argument in the Homestead neighborhood of Pittsburgh, Pa., Friday, and 89-year-old William Welsh, a funeral director who had hired the victim for contracting work, was arrested and charged.

Seth Randall Rushing, 20, fatally shot himself in the head after riding four-wheelers with a group of friends in Jamestown, La., Friday afternoon. A woman was shot and critically injured while speeding away from a bar fight that spilled into the street in Avondale, Ariz., early Friday. A woman was shot while sitting in her car in front of a Sunoco station in Monessen, Pa., Friday afternoon, but police aren’t sure if the wound was self-inflicted.

A woman was shot and killed on the far east side of Kansas City, Mo., Friday night. A 33-year-old man was shot in the leg on the roof of a building in the Mission District of San Francisco, Calif., Thursday night. A man was shot in the leg and wounded at the Hall Manor Public Housing Complex in Harrisburg, Pa., Friday afternoon. A man was found dead of gunshot wounds in Baldwin Park, Calif., Friday night. A man accidentally shot himself in the leg while showing his wife how to fire a handgun in North Syracuse, N.Y., Friday morning.

The burned body of 31-year-old Randolph Scott Harris Jr. was found riddled with bullets inside a northwest Washington, D.C., apartment Friday morning. A man was shot in the back in Stearns Square in downtown Springfield, Mass., early Friday. Tiffany Tyler, 26, was shot in the Columbus Park neighborhood of Omaha, Neb., Friday night, and police arrested her boyfriend, Antonio Hattix, 25. A man was found shot and killed in Manteo, N.C., early Friday.

Brooke Toliver, 22, was shot in the leg in Allentown, Pa., late Thursday, the city’s third shooting in three days. Daniel Watkins, 19, was found slumped over the driver’s seat of a car with fatal gunshot wounds in Youngstown, Ohio, Thursday night. Mariel Bibiano, 26, was found with fatal gunshot wounds at the Country Hearth Inn & Suites in Aberdeen, N.C., Friday night. A man in his 20s who was shot and injured in Malibu, Calif., Friday night is refusing to cooperate with investigators.

David R. Witherell, 22, was shot in the arm and stomach during what police described as a “shooting sport activity” in Potsdam, N.Y., Friday evening. A 30-year-old man was shot in the leg in Lincoln Terrace Park in Brooklyn, N.Y., late Friday. A 23-year-old man was struck in the arm as he ran for cover during a drive-by shooting in Lakeland, Fla., early Friday. Joe Campos, 34, was shot in the chest and left in a parking lot on the east side of San Antonio, Tex., Friday night.

A man was injured after gunfire was exchanged following an argument in College Station, Tex., Friday night. 27-year-old Lamar King was fatally shot in the chest in Augusta, Ga., late Friday. 23-year-old Andre Pullen was shot in the back and killed in Gary, Ind., late Friday, becoming the city’s 32nd homicide victim so far this year. A 25-year-old woman was shot with a rifle in the Austin neighborhood of Chicago, Ill., overnight, and 11 others were wounded in shootings across the city.

Saturday:

A 4-year-old boy was shot in the head and wounded by a bullet that entered through the window of his Bradenton, Fla., home Saturday morning. Maurice Bradford, 15, was found dead in the street of gunshot wounds in Hemet, Calif., early Saturday. Kamau Chandler, 17, was shot three times at close range and killed after an argument escalated to gunfire in the Bedford-Stuyvesant section of Brooklyn, N.Y., early Saturday.

Four young men were shot below the waist in the parking lot of a McDonald’s drive-thru in North Dallas, Tex., Saturday night. 42-year-old Charles Pike and 37-year-old William Bennett were injured when Pike picked up a gun at a vendor’s table at a Hot Springs, Ark., gun show and it discharged Saturday morning. 25-year-old Michael Lovelace was shot dead early Saturday in Hampton, Va. Gregory Sawyers, 34, was found dead of multiple gunshot wounds at a Louisville, Ky., intersection early Saturday.

Luis E. Brandao, 30, was shot in the stomach while exiting his car in Brockton, Mass., early Saturday. A 47-year-old woman was shot in a home in which she rented a room in Spanaway, Wash., Saturday morning, and deputies are looking for at least three masked gunmen. A man was shot several times during a home invasion at a small party in Orlando, Fla., early Saturday. A man was found shot and killed in New Orleans, La., Saturday evening.

India Lomax, 21, died in a shooting outside an Anderson, S.C., nightclub that also wounded 33-year-old Willis Donald early Saturday. Three men were shot during a dispute between two rival groups in a home in Rockford, Ill., early Saturday. A man was fueling up at a gas station near London, Ohio, when at least two carjacking suspects approached and shot him in the head early Saturday. Two people were wounded in a shooting at Snub’s nightclub in Providence, R.I., early Saturday.

A shooting following a fight in Lansing, Mich., left a 22-year-old man and a 21-year old woman wounded Saturday morning. A 30-year-old man was shot in the chest several times and killed in Hartford, Conn., early Saturday. A man was fatally shot following an argument with a group of men at an Artesia, Calif., restaurant early Saturday. A man was shot in the buttocks with a rifle in Georgetown, S.C., Saturday evening, and 53-year-old James Dewey Mercer, also known as Peanut, faces attempted murder charges.

43-year-old Donna Louise Schumaker was shot and killed while helping someone move out of an apartment in northeast Harris County, Tex., early Saturday. A 27-year-old man was shot as he got out of his car in Springfield, Mass., early Saturday. One man is dead and three others were injured after a shooting in Farmington, N.M., Saturday night. A 21-year-old man is on life support and a 20-year-old man is hospitalized after a shooting in Framingham, Mass., early Saturday, and two teens were arrested.

A 34-year-old man was shot and wounded following a physical altercation with a 46-year-old man in Waianae, Hawaii, Saturday night. A shooting in Clinton, Md., left a man dead early Saturday. One person was hospitalized after a shooting in Clearlake, Calif., Saturday night. A man was fatally shot inside a Perris, Calif., home late Saturday. Malcolm Sampson, a high school sophomore, was shot in the back of the head, and Brennis Andrews, an adult, was shot in the leg during a house party in Alliance, Ohio, Saturday night.

Two Amish teenagers are in critical condition after the van they were riding in came under fire in Ashtabula, Ohio, Saturday night. One person was shot in the leg when someone fired into a vehicle following an argument in Lafayette, La., Saturday afternoon. 39-year-old William McClain was found lying in the street with a gunshot wound on the east side of Youngstown, Ohio, late Saturday.

A 51-year-old man was shot in the stomach and seriously wounded during an attempted robbery in St. Louis, Mo., Saturday night. A passenger in a car was shot multiple times and hospitalized with life-threatening injuries in the Lincoln–Lemington–Belmar neighborhood of Pittsburgh, Pa., Saturday afternoon. Anthony Hernandez, 19, was killed after two vehicles pulled up to where he was walking and someone began shooting in West Valley City, Utah, Saturday night.

Sunday:

An 11-year-old girl and a man in his 50s suffered graze wounds to the head in a shooting in Bernalillo County, N.M., Sunday afternoon. A 17-year-old girl was shot in the head and critically injured after passing a rifle around while drinking in Rapid City, S.D., early Sunday. A 17-year-old boy and a 21-year-old man were wounded when gunfire erupted outside an IHOP and McDonald’s in Tulsa, Okla., early Sunday.

A 17-year-old boy was shot in the leg in Colorado Springs, Colo., Sunday afternoon. A 17-year-old boy was killed in a shooting in Chesapeake, Va., Sunday evening. 17-year-old Darius D. Miller Jr. and 31-year-old Dennis L. Holland were killed in separate shootings in Louisville, Ky., early Sunday. 34-year-old Curtis Jones was shot and killed at a Bon Wier, Tex., church Sunday morning, and his uncle, Reverend Luther Jones, with whom he had a long-standing feud, is said to have pulled the trigger.

Three people were hospitalized after a shooting at a house party in west Charlotte, N.C., early Sunday. A man suffering from a gunshot wound walked into a hospital in the Avondale neighborhood of Cincinnati, Ohio, early Sunday. A 44-year old woman was shot and wounded in a northeast El Paso, Tex., nightclub early Sunday. One person was hospitalized with a gunshot wound in Lexington, Ky., Sunday evening. A man was found suffering from fatal gunshot wounds in the 7th Ward of New Orleans, La., early Sunday.

A man was killed and a woman was injured in a shooting in Kansas City, Mo., early Sunday. A 23-year-old man was shot in the stomach and a 21-year-old was shot in the hand after a short confrontation escalated to gunfire in Wichita, Kan., early Sunday. 33-year-old Shane Thompson was fatally shot while riding his bicycle in Orange County, Fla., Sunday afternoon. Butch Anderson was killed in a shooting at the Apple Village Apartments in Glenwood, Ga., Sunday afternoon.

Two people were killed and a third person was critically wounded during a domestic shooting in Wall, Tex., Sunday evening, and an Amber Alert was triggered after the suspected gunman fled with his two young children. 27-year-old Eric Maurice Feamster was shot in the chest and killed and 25-year-old Tyson Gaymon was injured in a shooting at the Clancy Hills Apartments in Salisbury, N.C., Sunday morning.

A woman was seriously injured after being shot in the parking lot of the Belvedere Lounge in Fort Wayne, Ind., early Sunday. A 41-year-old man was shot at least twice in Pawtucket, R.I., early Sunday. A woman was killed and a man was wounded in a shooting in San Gabriel, Calif., Sunday morning. A man between the ages of 18 and 25 was shot and killed at a North Las Vegas, Nev., apartment complex Sunday morning.

A man was shot three times in the parking lot of the Golden Nozzle car wash in Springfield, Mass., early Sunday; he is the fourth shooting victim in the city in as many days. Kevin Kirkland, 45, was shot to death in an argument over a TV in the East Carnegie neighborhood of Pittsburgh, Pa., early Sunday. A shooting in Fostoria, Ohio, left a woman dead and her daughter injured Sunday afternoon. A shooting in a nightclub parking lot left a man in critical condition in Marion, Ind., early Sunday.

According to Slate’s gun-death tracker, an estimated 6,633 people have died as a result of gun violence in America since the Newtown massacre on December 14, 2012.