US attorney general pledges 'going to take action' after Florida shooting
FILE PHOTO: U.S. Attorney General Jeff Sessions speaks on the growing trend of violent crime in sanctuary cities during an event on the Port of Miami in Miami, Florida, U.S. on, August 16, 2017. REUTERS/Joe Skipper/File Photo

U.S. Attorney General Jeff Sessions on Thursday pledged the Justice Department would work to vigorously enforce federal gun and violent-crime laws and preventively identify potential mass shooters, as the country reeled from a Florida school shooting that killed 17 people.

"It cannot be denied that something dangerous and unhealthy is happening and we are, once again, watching the images of our children — terrified — streaming from their school with their hands above their heads," the top U.S. law enforcement officer told a meeting of sheriffs. "We are going to take action. We must reverse these trends."

(Reporting by Lisa LambertEditing by Chizu Nomiyama)