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Yesterday morning, a student at Sparks Middle School in Nevada took his parents’ handgun to class and opened fire, wounding two 12-year-old boys and killing a beloved math teacher before killing himself. A student told CNN that she believes the shooter was a nice kid who’d been bullied. That afternoon, in remarks he made to to the nation’s police chiefs, Attorney General Eric Holder noted that the number of active-shooter incidents in the country has soared over the past five years.

In the 10 months since the Newtown massacre, several schools have experienced the trauma of a shooting: last week, a student at a high school in Austin, Tex., killed himself in front of other students. In August, a student at a high school in Winston-Salem, N.C., shot another student in the neck. In January, a 16-year-old boy who’d been bullied because of his red hair walked into his Taft, Calif., high school with a shotgun and 20 rounds of ammunition and seriously wounded a student before he surrendered.

The math teacher who died yesterday, Mike Landsberry, was a former Marine who’d completed several tours in Afghanistan and was trying to intervene when he was shot to death. The mayor of Sparks, Geno Martini, called the loss “devastating.”

“It’s very unfortunate that someone like that, who protected our country over there and came back alive, had to be taken at his work, at a school,” he said.

Here is today’s report.

—Jennifer Mascia

A 5-year-old boy was shot in the head and killed in Vidor, Tex., Monday afternoon. At the time of the shooting, the child was being watched by a babysitter, who carried the victim through the woods to a nearby home to get help. Authorities say the shooting appears to be accidental.

—BeaumontEnterprise.com

Two men were shot to death following an argument in a Las Vegas, Nev., apartment complex late Sunday. Detectives are not sure what prompted the argument or the gunfire.

—KVVU-TV

A man opened fire at a nightclub on the Las Vegas Strip amid a dispute over a cover charge, killing a male patron who tried to restrain the shooter and injuring two employees early Monday. Benjamin Frazier, 41, opened fire at Drai’s After Hours, a venue inside Bally’s hotel-casino, at around 5:45 a.m. Bystanders tackled the suspect, an ex-convict with a history of alcohol-related arrests, and managed to hold him until authorities arrived at the scene.

—Star Tribune

Germana Burlakoff, 37, was found shot to death in the bushes in front of her Boca Raton, Fla., condominium Sunday, and police believe her estranged husband, Ian Burlakoff, pulled the trigger. He was shot and killed by police after he ignored their commands and reached for his gun.

—The Palm Beach Post

Police say a man shot and killed his wife and turned the gun on himself in their home in Park Forest, Ill., Sunday night. Relatives had heard Tajuanna Davis, 32, and her husband, Gerard Jimerson, 33, arguing before shots rang out. Their daughter found them dead on the floor of their bedroom.

—Chicago Tribune

A woman was killed and a man was wounded in a shooting in West Palm Beach, Fla., Monday night. People were seen sobbing in the streets after the gunfire erupted. Police have urged anyone with information to come forward.

—CBS 12

51-year-old Edward Melone was shot and killed in East Naples, Fla., Sunday night, and police have arrested his 78-year-old landlord and next-door neighbor, Javier Ortoll. The two reportedly often fought about rent payments.

—WZVN

Police claim a 25-year-old woman was shot by her 27-year-old husband following a drunken altercation in Buckland, Alaska, Sunday night. When police arrived, the suspect armed himself with a rifle and yelled that he would not give up or go back to jail. He surrendered while carrying a toddler in one arm and the rifle in the other. The woman suffered a head wound an an amputated finger.

—Anchorage Daily News

One person was killed and two people were wounded when someone opened fire on a party bus in Dallas, Tex., early Monday. The driver of the bus then headed toward the hospital. An exchange of gang signs were reportedly thrown before the shooting. Police said they need help from the public identifying any potential witnesses or suspects.

—NBCDFW

Kurt Savage, a Coffeeville, Miss., police officer, was shot four times and wounded while responding to a domestic incident. He returned fire, killing the assailant, who has been identified as David Long.

—WMCTV.com

Misael Santiago, 32, was found shot to death in the driveway of a home in Billings, Mont., Sunday morning. Mahpevana-Hane Lorne Bearcomesout, 35, was arrested. No word on a motive. The suspected shooter is awaiting trial on six felony charges from an unrelated incident in May.

—Billings Gazette

A 26-year-old man was shot in the arm and wounded while walking with a friend in Linden, N.J., early Sunday. He ran for cover when he initially heard gunshots, but as he ducked into a house he realized he’d been hit in the shoulder. Police are soliciting tips.

—NJ.com

A man threatening violence during a community party on the outskirts of Bishopville, S.C., early Sunday, was shot in the chest and killed. Timothy Kennedy, 23, who was kicked out of the party at around 2:30 a.m., vowed to return with a gun. When he did, he was shot to death by two private security guards working the door.

—WISTV.com

A 23-year-old man was shot in the back and killed in the Chatham neighborhood of Chicago, Ill., Monday afternoon. Police are investigating.

—WLS-TV

A 22-year-old University of Kentucky student was shot in a drug-related incident in Lexington, Ky., late Sunday. The victim told police he was being followed, and as he approached his home, he was shot by one of the suspects, who then entered the home. Two roommates confronted the suspects with a rifle and fired warning shots. The suspects fled. The woman who fired the rifle has been charged with tampering with physical evidence and possession of drug paraphernalia.

—Kentucky Kernel

A 31-year-old man shot through the wrist and wounded in New Haven, Conn., Monday afternoon was the third person shot there in the last week. The victim was found bleeding on the sidewalk in front of a deli. The day before, a 34-year-old man was shot several times and wounded. Nathaniel Bradley, 36, was shot and killed last Monday.

—New Haven Register

A 36-year-old woman suffered a gunshot wound outside of Club Illusion in East St. Louis, Mo., early Sunday. The victim had been attending a family party at the club when an argument broke out among relatives. An investigation is ongoing.

—BND.com

A man was shot multiple times at an apartment complex in Garland, Tex., Sunday afternoon. Markus Anthony Wall, 23, was arrested.

—DallasNews

A shooting in Holyoke, Mass., sent a 38-year-old man and his nephew to the hospital Monday evening. Police are soliciting tips.

—WWLP.com

Jeremiah Gomez, 35, was shot and killed at his home in northeast San Antonio, Tex., Saturday night, following a confrontation over drugs. Clarence “Hardcore” Wright, 23, was arrested.

—mySA.com

A 19-year-old man was shot three times and killed in the Frankford neighborhood of Philadelphia, Pa., Monday afternoon. Police say two men approached the victim outside a row home and opened fire in front of children coming home from school. The two men fled in a car, which crashed, so they continued on foot.

—MyFoxPhilly.com

A 33-year-old war veteran was pistol-whipped and shot in the back during an attempted carjacking in the Society Hill area of Philadelphia early Monday. Police say the victim had just left a nightclub and was jumped as he opened his car door. Police are investigating.

—MyFoxPhilly.com

A man was shot and wounded in northeast Portland, Ore., Monday night. Officers have been unable to locate anyone matching the suspect’s description.

—KOIN.com

Sergio “June Bug” Rodriguez, 43, was shot and killed in Salinas, Calif., Monday morning. Witnesses described a man in his early 20s running from the scene. Rodriguez had been heavily involved in gangs in the past, police said, but dropped out several years ago.

—The Herald

22-year-old Stephen Trevor Chapman was allegedly shot and wounded by a 68-year-old man who found the victim in bed with his 63-year-old wife in the SaddleBrooke adult community of Tucson, Ariz., early Saturday. After finding the couple in the guesthouse of his home, the man fired a warning shot at Chapman, and the round struck a wall and injured Chapman’s hand.

—Arizona Daily Star

According to Slate’s gun-death tracker, an estimated 9,690 people have died as a result of gun violence in America since the Newtown massacre on December 14, 2012.