DEL RIO, Texas — Haitian migrants in federal custody have “hijacked” multiple buses during transport rides and forced out drivers in incidents that threaten to stop the U.S. government’s immigration enforcement operations, according to three people familiar with the incidents.

“They’ve been basically overpowering the drivers and they’ve actually hijacked a couple of the buses and driven them down the road a little ways and escaped. This happened multiple times,” a senior federal law enforcement official told the Washington Examiner Tuesday evening.