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TALLAHASSEE, Fla. (AP) - The Latest on a shooting at a Florida high school (all times local):

The National Rifle Association has filed a federal lawsuit over gun control legislation Florida Gov. (Reuters) - Florida Governor Rick Scott, a staunch ally of the National Rifle Association (NRA), signed into law on Friday a bill imposing a 21-year-old legal age requirement and three-day waiting period on all gun purchases and allowing the arming of some school employees. Chris W. Cox, executive director of the NRA’s Institute for Legislative Action, says the bill “punishes law-abiding gun owners for the criminal acts of a deranged individual.”

The bill signed Friday raises the minimum age to buy rifles from 18 to 21, extends a three-day waiting period for handgun purchases to include long guns and bans bump stocks that allow guns to mimic fully automatic fire. The Marjory Stoneman Douglas High School Public Safety Act — passed three weeks after a mass shooting at the school killed 17 people — raises the minimum legal age for buying any guns in Florida from 18 to 21 and would allow some teachers and other staff in the Florida school system to be armed after training. It raises the minimum age for buying rifles from 18 to 21 in the state - although 18, 19 and 20-year-old police officers and members of the security forces will still be able to buy rifles and shotguns

in the state - although 18, 19 and 20-year-old police officers and members of the security forces will still be able to buy rifles and shotguns It bans bump stocks - devices that raise the firing speed of semi-automatic rifles

- devices that raise the firing speed of semi-automatic rifles It introduces a three-day waiting period on all gun purchases (previously this only applied when people bought handguns)

(previously this only applied when people bought handguns) It makes it easier for police to confiscate weapons and ammunition from people who are deemed to pose a threat of violent behaviour (a measure that has been proposed by five other states in the last month, according to the Brady Campaign to Prevent Gun Violence)

from people who are deemed to pose a threat of violent behaviour (a measure that has been proposed by five other states in the last month, according to the Brady Campaign to Prevent Gun Violence) It allows school staff to carry guns, with the agreement of their school district authorities and sheriff's department. The bill also was controversial for including provisions allowing school staff to be specially trained and deputized to carry guns on the job as campus “guardians,” though local sheriffs and individual school districts may opt out of the program if they wish. The Parkland massacre and response to it by Florida lawmakers signaled a possible turning point in the national debate between advocates for tougher firearms restrictions and proponents of the right to bear arms as enshrined in the Second Amendment of the U.S. Constitution.
The NRA is suing Florida after it passed a gun control law which would raise the minimum age for purchasing guns from 18 to 21.