A dramatic video of the Texas shooting reveals that the shooter stayed inside for 77 minutes while students yelled for help.

A dramatic video of the Texas shooting reveals that the shooter stayed inside for 77 minutes while students yelled for help.

Disturbing new video footage shows children fleeing the Texas massacre school as a police dispatcher can be heard advising that a classroom is ‘full of victims’ of the mass shooting.

The clip, broadcast by Good Morning America on Monday morning, shows cops smashing windows at Robb Elementary School in Uvalde, Texas, on May 24.

Children and a few adults can be seen fleeing the building moments later. Meanwhile, chilling audio footage can be heard being broadcast over police radios detailing the scale of the bloodbath.

That saw 19 children and two teachers shot dead by gunman Salvador Ramos, 18, who was later shot dead by cops.

A 911 dispatcher can be heard to ask: ‘Room 12, are we able to .. is anybody inside of the building … 2-1, child is advising he is in the room. Full of victims. Full of victims at this moment.’

The video and audio sheds fresh light on the 77 gut-wrenching minutes Salvador Ramos, 18, was inside the building, before he opened fire and went on a shooting spree killing 19 children and two teachers, and injuring others.

On Monday, the Justice Department said they are planning to review police response after angry and grief-stricken parents wanted to know why police didn’t engage with the shooter more quickly.

At a press conference, top cop, Col. Steven McCraw, Director of Texas Department of public safety, appears shaken and teary-eyed, as he shares the agonizing details of a call by a child trapped inside the classroom as the gunman entered.

‘She identified herself and whispered that she was in Room 12,’ McCraw said.