3 students, 3 adults killed in Nashville school shooting Security video shows suspect inside school

Authorities have publicly released surveillance footage surrounding Monday's deadly school shooting at a Christian elementary school in Nashville.

Earlier in the day, police identified the shooter as 28-year-old Audrey Hale, a former student at The Covenant School. According to police, Hale killed three children and three adults after elaborately planning the massacre by drawing out a detailed map and conducting surveillance of the building.

The surveillance video, which was posted on Twitter late Monday night by Nashville police, shows Hale driving into the school's parking lot at 9:54 a.m. Central. As Hale arrives, a group of children can be seen in the background on a playground.

Around 10:11 a.m., Hale can be seen gaining entry into the school by firing into glass doors on the building, shattering them.

The video, shared by police less than 12 hours after the shooting, does not contain any audio.

Around three minutes later, the shooter can be seen walking through a hallway holding a gun and leaves the frame of the video. At this point, alarms appear to be flashing throughout the school.