A U.S. Border Patrol agent has been killed in southeastern California, according to Fox News. The agent, whose name has not yet been released, was struck and killed when he tried to stop a vehicle that illegally entered the U.S..

The agent was killed about 20 miles west of Yuma in the Imperial Sand Dunes Recreation Area, a spot along the border that is popular with off-road vehicle enthusiasts and frequently used by smugglers.

The agent attempted to impede the vehicle’s progress before he was hit, but the Border Patrol did not immediately have more information, said agent Eric Anderson, a spokesman for the agency’s Yuma sector.

The name of the agent killed was not immediately released because his family had not been notified.

Witnesses told the Yuma Sun newspaper that agents were chasing a Hummer and a Ford pickup on Interstate 8 when the vehicles turned into the dunes and fled toward Mexico. The agent was trying to place spike strips in their path and was struck by the Hummer, they said.

Thoughts and prayers to the family and friends of the agent.