SAN DIEGO -- Police searched Wednesday for two men, one of them armed, who brazenly walked out of a Best Buy store in Mission Valley with a shopping cart full of stolen merchandise, authorities said.

The robbers entered the Best Buy at 5151 Mission Center Road Tuesday night and filled a shopping cart with merchandise, said San Diego police Sgt. Bob Dare.

The robbers started to walk out of the front door around 9:15 p.m. when a store security guard stopped them, he said.

One of the suspects lifted the front of his shirt to show a handgun in his waistband and told the employee not to say or do anything, Dare said.

The gunman stood with the store security guard as the second robber pushed the cart outside, Dare said. The guard was not harmed.

The gunman was described as a black man in his mid-20s to early 30s, about 5 feet 9 inches tall, 180 pounds and sporting a thin goatee. He was last seen wearing large-frame sunglasses, a white, blue and black hooded sweatshirt and jeans.

His accomplice was a black man, also in his mid-20s to early 30s, who stood about 5 feet 8, weighed more than 200 pounds and wore a light-colored short-sleeve shirt and light-colored jeans, police said.

Another store on Mission Center Road was robbed Monday. A Mimi's Café manager handed money over to a robber after he told her he had accomplices outside who would hurt her otherwise. The cafe is right across the street from Best Buy. The robber in that heist remains at large.