Authorities are on the lookout for a man who fired gunshots from a pickup near two troops standing guard at a major military base in southern Mississippi.

No one was wounded in the Tuesday shooting near Camp Shelby.

Perry County Sheriff Jimmy Dale Smith told a news conference that it happened midday near a checkpoint but not inside the base.

Authorities don't have a motive. They're looking for a maroon pickup truck.

The large military base south of Hattiesburg is one of the premier training facilities for National Guard troops from across the country.

During the height of the Iraq war, Camp Shelby was often the last stop for National Guard troops training to go to the Middle East.