A Customs and Border Protection agent shot a driver Thursday who attempted to run over an agent at a port of entry on the U.S.-Mexico border in Arizona, reports said.

Mexico’s border officers surrounded the vehicle after its momentum carried it across the border, and they found two men inside, according to the Arizona Republic. The driver had been shot in the head and a passenger was arrested, the paper reported, citing local outlet the Nogales International.

The driver's condition was not immediately available.

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Nogales Mayor Arturo Garino told FOX10 Phoenix that he heard from other city officials that the driver was attempting to cross south into Mexico at the DeConcini Port.

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Border Protection and Nogales police officials both alerted that the port of entry's outbound lanes were shut down due to an emergency, but did not elaborate. The agencies issued an update about an hour later stating the crossing had been reopened.

This is a developing story. Check back for updates.