Emergency calls from parents and students during the Florida high school massacre show 911 operators at first trying to grasp the enormity of the emergency and then calmly trying to gather information to assist arriving law enforcement officers.
The Broward County Sheriff's Office released audio of 10 of the 81 calls its 911 center received during the Feb. 14 shooting that left 17 dead and its aftermath as investigators develop a timeline of the response.
The Broward County Sheriff's Office radio system is being analyzed because the deputies and officers couldn't communicate with each other.
Authorities believe there was a radio system failure that day.
Calls were coming in from students hiding in classrooms and from parents, who were getting calls from their children.
In one 16-minute call, a man relayed information from a mother who was on another line with her daughter. The girl was in a classroom with just one other girl, but there was nowhere to hide.
The 911 operator got information and instructed them to be quiet in case the shooter was nearby.
Her mom could be heard telling the girl, "I love you, I love you."
After about 15 minutes, police officers entered the building and led the girls out.