Authorities in Maryland say that three masked teenagers hopped onto a school bus late Monday afternoon and attempted to kill a 14-year-old boy on board.

"This was an attempted murder, plain and simple," Martin Diggs, head of the bus drivers’ union in Prince George’s County, told WJLA-TV about the Monday incident near the Iverson Mall. "Call it what it is."

After the three teenagers boarded the bus, one of them is said to have pointed a gun at the 14-year-old’s head and pulled the trigger three times.

The gun did not fire, and police say they later found three live rounds on the bus.

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"They pulled the trigger three times, but for some reason, by the grace of God, the gun didn’t go off and bullets flew out of the gun," Diggs said. 

Fox 5 DC reported that the suspects, who were wearing hoodies as well as masks, pistol whipped the teenager after the gun misfired.

"They tried to kill my son three times and they failed," the victim's mother told the outlet. "And you know what I would say to them? You are cowards, You're gonna forever be a coward. You're not gonna have any good luck. And you will get caught."

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Diggs is calling for more security on county school buses and said the driver believed he would be killed during the incident.

"They’re terrified," Diggs said. "The one driver does not want to come back to work. They’re terrified. They don’t even want to come out of the house."

"We are outraged as a district," Charoscar Coleman, associate superintendent of Prince George’s County Public Schools, said. "Horrified that this incident did occur."

A spokesperson for the Prince George's County Police Department said a press release on the matter will be issued on Thursday. 

The suspects are currently on the run.