Thieves fled to Mexico in a stolen U.S. Border Patrol vehicle, an agency spokesman said Tuesday.
The vehicle was stolen Sunday in the Border Patrol's El Centro sector, which encompasses eastern California's border with Mexico.
The sector includes the Imperial Sand Dunes, a desert playground for off-road vehicle enthusiasts that attracts marijuana smugglers, and the city of Calexico.
Border Patrol spokesman Enrique Lozano declined to elaborate on any aspect of the theft, including the how, where and by whom the vehicle was stolen.
The agency has asked Mexican authorities for help locating the vehicle and the thieves.
"Everything is under investigation and it's a very sensitive matter," Lozano said.