A CBP officer shot Ramiro Montalvo Jr., a U.S. citizen allegedly armed with a screwdriver, Wednesday at the Otay Mesa commercial port of entry

An assault suspect was shot by a U.S. Customs and Border Protection officer at the Otay Mesa Port of Entry Wednesday after allegedly advancing toward an officer while holding a screwdriver and ignoring commands to drop the weapon.

No trucks were being allowed to cross at the port. It was unclear when the closure began or what prompted the decision.