Trapped on the floor between the bus seats, a 13-year-old boy cried out as he received punched after vicious kick from the three bigger, older youths.

The driver of the Florida school bus alerted the dispatcher, pleading for aid, but offered nothing to physically help the teen.

UPDATE: ACLU and other civil rights groups still silent on the case – more here

Joshua Reddin, Julian McKnight, and Lloyd Khemradj, all 15 years old, were arrested a short time later.

The bus driver, at least according to his school’s policy, did nothing wrong. “Get somebody here quick,” he said.

The attack took place July 9 in Pinellas County, Florida. But the horrific cell phone video — and the surveillance video are both just now available.

As the boy is pummeled, the bus driver John Moody yells at the assailants to leave the boy alone.

He also asks dispatchers to send help.

“You gotta get somebody here quick, quick, quick, quick,” he says. “They’re about to beat this boy to death over here.”

“Please get somebody here quick. There’s still doing it,” he adds. “There’s nothing I can do.”

Moody, 64, says he was too afraid to step in.

“The three boys just jumped on him and started pounding on him. And I did all can,” he told CNN affiliate WFLA. “I was looking. It was like I was in shock. I was petrified.”

The 13-year-old was left with two black eyes and a broken arm.

All three teens are charged with aggravated battery. Reddin is also charged with unarmed robbery. All three have been released from police custody.

“There was clearly an opportunity for him to intervene and or check on the welfare of the children or the child in this case and he didn’t make any effort to do so,” Chief Robert Vincent of Gulfport Police Department told the affiliate.