Teens in masks attempt to kill 14-year-old on school bus, pistol whip him after gun fails to fire

Three masked teenagers tried to kill a 14-year-old boy on a school bus in Maryland.
One suspect pointed a gun at the victim's head and pulled the trigger three times, but the gun did not fire.
The suspects beat the victim with a gun after it misfired.
The bus driver feared for his life, and the head of the bus drivers' union wants more security on county school buses.
The suspects are on the run, and there is a cash reward for information leading to an arrest.