US Border Patrol involved in shooting in Arizona, county sheriff says

The US Border Patrol was involved in a shooting in Arizona on Tuesday, Pima County Sheriff Chris Nanos said in a statement, adding that his office was working with the FBI and Customs and Border Protection to look into the incident.

NBC News earlier reported, citing a Pima County Sheriff spokeswoman, that a person was in critical condition after being shot in an incident involving the Border Patrol.

The circumstances of the incident were not immediately clear and the person who was shot has not been identified.