TUCSON, Ariz. (CBS Las Vegas) — Border Patrol agents in Arizona were reportedly fired upon by a Mexican military helicopter that traveled across the border.

KVOA-TV reports that Mexican authorities were conducting a drug interdiction operation when the incident happened early Thursday morning on the Tohono O’odham Indian Nation. The Mexican chopper fired at the agents and then flew back into Mexico.

Art del Cueto, Border Patrol Tucson Sector union president, tells KVOA that they called and apologized for the incident.

“The incident occurred after midnight and before 6 a.m. Helicopter flew into the U.S. and fired on two U.S. Border Patrol agents,” del Cueto said in a statement to KVOA. “The incident occurred west of the SanMiguel Gate on the Tohono O’odham Indian Nation. The agents were unharmed. The helicopter went back into Mexico. Mexico then contacted U.S. authorities and apologized for the incident.”

Andy Adame, Border Patrol spokesperson, said that Mexican authorities fired two shots at the border agents.

“Two shots were fired from the helicopter but no injuries or damage to U.S. property were reported,” Adame told KVOA.

The incident is under investigation

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