Four people, one armed with a gun, have robbed a bar in Palmerston North.

About 9.05pm last night the four offenders entered Rex's Bar on Fairs Rd, taking money from the till and safe before fleeing in a silver sedan car.

Two staff members and two patrons were in the bar at the time of the robbery but were uninjured.

Police are seeking witnesses of the robbery, and are also looking for a 2000 silver Subaru B4 vehicle which was stolen from the area.