Border agent fires at rock throwers at Nogales fence

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TUCSON, Ariz. -- A Border Patrol agent fired a shot at the border fence in Nogales Monday after being attacked by rock throwers.

Agents were busting a drug-smuggling attempt on the east side of Nogales when people threw rocks at the agents. One of the patrol officers felt threatened and fired his service weapon.

Authorities are investigating claims that a person in Sonora, Mexico was hit in the arm by a bullet.

The incident is under investigation.