A security guard in Imperial Beach reported being shot at by one of two men in a passing SUV Saturday night, sheriff’s officials said.

The guard said he was at Eighth Street and Boulevard Avenue about 10:35 p.m. when he saw a muzzle flash from a red sport utility vehicle, possibly a Ford Explorer, sheriff’s Lt. Jim Nolan said.

The round missed, but the guard ducked down instinctively, Nolan said. Deputies found one shell casing in the street.