The border wall is illuminated at night in Nogales, Arizona....

The border wall is illuminated at night in Nogales, Arizona. (July 6, 2012) Credit: Getty Images

The U.S. Border Patrol says agents opened fire along the Rio Grande after being pelted by rocks and having a gun pointed in their direction.

Border Patrol spokesman Henry Mendiola says no agents were injured in the incident Saturday near Brownsville. He did not know if anyone else was hurt. The Mexican government was notified.

The Border Patrol released little details about the morning gunfire, including what the suspects were doing on the river.

Mendiola says one of the agents started shooting after being "unable to take cover" when rocks were thrown. He says another began shooting after seeing a suspect on the Mexican side of the river pointing a gun at him.

Several people are in custody. Mendiola says he did not know details about the suspects or charges.

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