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semi-automatic weapons

Experienced gun hobbyists recognized the sound right away.

"I knew for a fact it was a bump stock as soon as I heard the video," says Jeff LaCroix. He's a recreational shooter in Louisiana. He says the rapid, uneven sound of the gunfire at the Route 91 Harvest music festival in Las Vegas last Oct. 1 made it clear to him a bump stock was involved.

With frustration mounting over lawmakers' inaction on gun control, the American Medical Association on Tuesday pressed for a ban on assault weapons and came out against arming teachers as a way to fight what it calls a public health crisis.

One man in upstate New York sawed his AR-15 rifle into pieces and posted a video of it on Facebook. A woman in Connecticut did the same with her handgun. Not far from scene of the Florida high school shooting in Parkland, another man brought his assault weapon to police and asked them to destroy it.

The teenager accused of using a semi-automatic rifle to kill 17 people at a Florida high school confessed to carrying out one of the nation's deadliest school shootings and concealing extra ammunition in his backpack, according to a sheriff's department report released Thursday.

Nikolas Cruz told investigators that he shot students in the hallways and on the grounds of Marjory Stoneman Douglas High School in Parkland, north of Miami, the report from the Broward County Sheriff's Office said.