Updated

Authorities say workers who were repairing a road near the U.S.-Mexican border in West Texas were fired upon by an unknown gunman in Mexico.

Hudspeth County Chief Deputy Sheriff Mike Doyal says a crew of four county employees was working on the county road along the Rio Grande late Thursday morning when they heard around eight rounds fired from across the river.

The workers quickly fled after several of the rounds hit the ground near them, kicking up dirt.

No workers were injured. Authorities found no suspects in the area, situated about 15 miles south of Interstate 10 between Fort Hancock and Sierra Blanca.

One witness told investigators he saw a white pickup truck speed away from the area after the shooting.