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The police chief in Sanford, Fla., where George Zimmerman, a neighborhood watch volunteer, shot and killed 17-year-old Trayvon Martin last year, is set to unveil rules stressing that volunteers are not to carry guns or follow suspects. In a community meeting next week, Police Chief Cecil Smith, who took over the department in April and quickly and suspended the neighborhood watch program, will emphasize that members are to call police when they see a suspicious person or activity. Zimmerman was acquitted of second-degree murder in July.

On Tuesday, Sybrina Fulton, Trayvon Martin’s mother, made an impassioned plea before a congressional committee to amend “stand your ground” self-defense laws. The laws, which exist in some form in 30 states, allow a person to use deadly force in self-defense when they feel threatened with bodily harm. Fulton argued that such laws “certainly did not work” in her case.

“The person that shot and killed my son is walking the streets today,” she said. “We need to do something about this law when our kids cannot feel safe in our own community.”

But Senators Ted Cruz and Louis Gohmert strenuously objected. “The idea that states are less intelligent or less able to discern their citizens’ needs is a mistake of federal proportions,” Gohmert said.

Here is today’s report.

—Jennifer Mascia

A 2-year-old girl was shot at an apartment building in Bangor, Maine, Wednesday afternoon. A neighbor believes the shooting was accidental, and that the gun went off when it hit the floor. The child’s family was home at the time.

—Bangor Daily News

Three children—ages 3, 5 and 7—were shot while sleeping in their home in Jackson, Miss., early Wednesday. Someone in a vehicle opened fire on their home just after midnight. Investigators are trying to identify the target of the shooting.

—ClarionLedger.com

An 11-year-old boy was shot in the shoulder in southwest Atlanta, Ga., Wednesday night. His brother carried him a few houses down the street to their home, where a family member called 911. Investigators believe the child was struck as two groups of people exchanged gunfire in the street. No one is in custody.

—AJC.com

A 13-year-old girl was wounded when a bullet came through her bedroom wall in St. Petersburg, Fla., Tuesday afternoon. Police said a firearm accidentally discharged when her 14-year-old cousin was trying to unload it in a bathroom. Detectives are trying to identify who provided the boy with the firearm, which has not been located.

—The Tampa Tribune

A 14-year-old boy was shot in the chest and arm in the Knoxville neighborhood of Pittsburgh, Pa., Tuesday evening. The victim and several of his friends were sitting on a porch when someone came out from between two homes and began shooting. Police said the victim is not cooperating.

—WPXI.com

A 16-year-old boy was shot in the chest and critically injured and a man was shot in the back in the Sixth Ward of New Orleans, La., Wednesday night. Police haven’t announced a suspect or a motive.

—WWLTV.com

A 16-year-old student at Woodrow Wilson High school in Dallas, Tex., was shot and wounded in a park near the campus Tuesday afternoon. Emilio Tovar, 19, who graduated from the school two years ago, walked into a police station and surrendered. He claimed friends on Facebook framed him.

—WFAA.com

A 16-year-old boy was shot and wounded while walking with his friends in north St. Louis, Mo., Tuesday night. Someone took out a gun and began firing at the group. The victim tried to run away but realized he had been shot in the back. An investigation is ongoing.

—KMOV.com

A teenage boy, thought to be 15 or 16, was shot at an apartment complex in Arlington, Tex., early Wednesday. Upon being shot, the victim tried to break into the front door of a nearby supermarket. He was found in the supermarket’s parking lot. No word on possible suspects.

—CBS DFW

A junior high school student shot and wounded himself in the bathroom of his school in Smithville, Tex., Wednesday morning. The school was placed on a brief lockdown.

—Statesman.com

A young girl entered the office at Charleston Elementary School in Los Banos, Calif., Wednesday morning and reported to a school administrator that her father had been shot. The victim was found lying on the ground across the street. Authorities learned that someone had driven the victim and his daughter to the campus after he was shot at his home. No motive has been revealed.

—ABC 30

24-year-old Kelsie McDonald was killed in a domestic shooting at her home in Pike County, Ind., late Tuesday. 32-year-old Christopher Morton was found in the kitchen with a handgun in one hand and a beer can in the other. He was arrested for murder.

—14News.com

A 25-year-old woman was shot twice and wounded while walking down a street in north Philadelphia, Pa., Tuesday night. Police didn’t reveal suspects or a motive.

—NBC10 Philadelphia

Three people were shot in east Palo Alto, Calif., Tuesday night. Police are asking anyone with information to contact them.

—Palo Alto Online

A 19-year-old man was shot in the leg in Wilmington, N.C., Wednesday night. Police are searching for a suspect.

—WECT.com

A 20-year-old woman was shot in the chest and critically injured in the Fountain Park neighborhood of St. Louis, Mo., early Wednesday. Police said someone opened fire on a group of people sitting outside. No word on a suspect.

—CBS St. Louis

21-year-old Solomon Ancrum was found shot to death in his car in Mount Pleasant, S.C., Wednesday morning. Deputies are looking for three suspects.

—ABCNews4.com

An 18-year-old man was shot and critically injured in south Philadelphia, Pa., Wednesday night. No word on what led to the shooting. There have been no arrests.

—CBS Philly

45-year-old Darren “Jerome” Nelson was shot and critically injured at the Union Gospel Mission in the Pioneer Square area of Seattle, Wash., Wednesday morning. Lunch service was set to begin in the shelter’s community room when an argument broke out between two men, possibly when one of them bumped the other. The suspect, 82-year-old Roger Mize, took out a gun and shot the victim twice before shelter staff stepped in. He was arrested.

—Seattle Times

Shootings on the South and West sides of Chicago, Ill., injured three men Tuesday night. In the Chatham neighborhood, a 57-year-old man was shot in the finger when someone opened fire from a vehicle. A few hours earlier, a 52-year-old man was shot in the West Town neighborhood, and two hours before that, someone shot a 21-year-old man in the the elbow in the Rosemoor neighborhood.

—Chicago Tribune

A 47-year-old woman was shot in the stomach and seriously wounded when she struggled with an armed man who broke into her home in the Austin neighborhood of Chicago, Ill., Wednesday night. The suspect fled, and when the woman chased after him, she saw a second intruder run out the front door. Police are investigating.

—Chicago Sun-Times

An armed intruder was shot when the intended victim opened fire in Orange County, Fla., early Wednesday. Two men and a woman invaded an apartment at about 3:35 a.m., and a resident shot one of the men. Police caught the intruders, who were armed with a shotgun and a handgun, before they could leave the parking lot.

—Orlando Sentinel

Dillon Morgan, 18, was shot in the head and critically injured in River Ridge, La., Tuesday evening. The victim was able to identify Demond Stewart, 21, as the gunman. Stewart was arrested and charged with attempted second-degree murder. He told investigators the shooting stemmed from a drug deal.

—NOLA.com

Dior T. Cheney, 23, was fatally shot in the head when the car he was driving came under heavy fire in Columbus, Ga., Tuesday night. 32-year-old Dashawn Porter, who was with the victim, was treated for a gunshot wound. Investigators are searching for leads.

—Ledger-Enquirer

A man and his son were wounded in a gang-related road-rage shooting in the Oakwood neighborhood of Venice, Calif., Tuesday night. The victim, who is in his 50s, was riding his motorcycle when he was cut off by five suspected gang members, who then followed him home, where the confrontation continued. The man’s son, who is in his 20s, came outside to aid his father; he was possibly armed. One of the gang members opened fire. There have been no arrests and the investigation is ongoing.

—Los Angeles Times

A man was shot multiple times at the Happy Shopper in Hampton, Va., Wednesday afternoon. The motive is unknown.

—WAVY.com

23-year-old Dominick Floyd was shot and killed in an armed robbery at New York Fried Chicken in Grand Rapids, Mich., early Thursday. Another man, 20, who police believe is the suspect, was shot and turned himself in at the hospital.

—Fox 17

A man in his 30s was shot in the leg while standing on a sidewalk in the Tenderloin neighborhood of San Francisco, Calif., Tuesday night. The suspect then ran to a car and fled.

—The San Francisco Appeal

A 22-year-old man was shot in the stomach while approaching his apartment west of the Galleria area of Houston, Tex., early Wednesday. Two men jumped the victim and tried to take his money, and when he fought back, the robbers opened fire. The suspects fled.

—KHOU.com

57-year-old Alvin Moore was shot and killed in his apartment in Las Vegas, Nev., Tuesday night. Witnesses saw two men leaving the scene.

—Fox5Vegas.com

Charles Newell, 39, was shot in the arm and wounded on a street corner in Anderson, S.C., Wednesday night. He was found unresponsive at the scene but revived by emergency medical technicians. Police do not yet have any suspects.

—FoxCarolina.com

According to Slate’s gun-death tracker, an estimated 10,022 people have died as a result of gun violence in America since the Newtown massacre on December 14, 2012.