Video shows off-duty Uvalde officer waiting in hallway to enter classroom where his daughter was killed

• Surveillance footage shows the inside of Robb Elementary School as the school shooting was underway.
• It shows a Uvalde officer, whose daughter was killed, waiting in the hallway as the shooting was underway.

New surveillance footage from the Uvalde school shooting shows an officer waiting to enter the classroom where his daughter was killed.

The footage, which was obtained and released Tuesday by the the Austin American-Statesman, shows law enforcement's response as the May 24 shooting at Robb Elementary School unfolded. The attack resulted in the deaths of 19 students and two teachers, all of whom were in the same two fourth-grade classrooms.

Among those killed was 10-year-old Alexandra "Lexi" Rubio, who was the daughter of Uvalde County Sheriff Deputy Felix Rubio.

The footage shows Rubio arriving in the hallway around 57 minutes after the shooter first entered the school. Rubio is seen wearing a uniform and carrying a rifle.

The video shows Rubio standing at the end of the hallway as officers encircle the classroom. At one point, he appears to be rubbing his eyes and clasping his hand over his mouth as two other officers place their hands on his shoulders.

It is unclear whether he knew his daughter was in the classroom at the time.

Rubio later told Texas House lawmakers that he was off duty at the time of the shooting, but immediately rushed to the school when he heard what had happened, ABC 11 reported.

"Once I [saw] them open the door and open fire, my heart dropped," he told lawmakers, ABC 11 reported.

Roughly 77 minutes had passed between the time the shooter entered the school and was shot and killed by a Border Patrol agent.

Rubio's wife, Kimberly Mata-Rubio, who also attended the House hearing, told lawmakers that they both attended an award ceremony for their daughter hours before the shooting and promised her ice cream later that night.

The couple said they did not blame law enforcement for what happened but called for the ban of military-style rifles.

"There is no reason for just the average citizen to have these types of weapons. What for? What do you need them for? Like, is it worth my kid? These kids?" Mata-Rubio said, ABC 11 reported.

Uvalde was the deadliest school shooting since the 2012 attack on Sandy Hook Elementary School.