Hagerstown police were investigating an armed robbery Sunday morning in the 1200 block of Potomac Avenue.

The incident occurred at about 4:30 a.m. Police arrived to find three teenagers who said they had been robbed of their wallets, money and electronic devices by three males, police said. One of the males was armed with a semiautomatic handgun, police said.

Police said they were looking for three black males in their mid- to late teens, all wearing dark hoodies. They ranged in height from 5 feet 5 inches to 6 feet tall with small to medium builds, police said.