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CALEXICO, Calif. – A man was shot and killed Wednesday morning after allegedly attacking customs officers with a knife at the Calexico West Port of Entry.

The man approached U.S. Customs and Border Protection officers on a bike just after midnight, according to the agency. He got off his bike with a knife in his hand and walked toward an officer, investigators said. The officer felt threatened and shot the man.

Officers administered  first aid until paramedics arrived. The man was taken to ahospital, where he died.

The customs officer was not injured.

The U.S. Department of Homeland Security’s Office of Inspector General, the Calexico Police Department and Customs and Border Protection are investigating the incident.