Heres some detail
According to a multinational forces statement, the car approached the checkpoint at high speed about 9 p.m. (1 p.m. ET)
U.S. troops "attempted to warn the driver to stop by hand and arm signals, flashing white lights, and firing warning shots in front of the car," the statement said. "When the driver didn't stop, the soldiers shot into the engine block, which stopped the vehicle, killing one and wounding two others
Thats from the CNN link at top. I have no idea why he would think its ok to race at high speed at a checkpoint. Its a tradgedy that could have been avoided.