Police are looking for this man in connection with a robbery of a 7-Eleven on Dec. 6 in the 2500 block of Benning Road NE. (N/A/DC Police)

A man carrying a long gun resembling an assault-style weapon with a sound suppressor robbed a convenience store in Northeast Washington early Wednesday and ordered two employees to their knees, according to police.

The robbery occurred about 3:50 a.m. at a 7-Eleven in the 2500 block of Benning Road NE, near Langston Golf Course. Police described the weapon as a black "AK-47 style gun."

Police said the man wearing a dark coat, black scarf over his face and carrying a dark green backpack ordered a clerk to open two cash registers. The gunman then ordered the clerk to lock the front door, according to a police report.

The man then grabbed an undetermined amount of money and ordered the clerk to a back office. Police said another employee emerged from a walk-in freezer, and he too was forced into the office.

Police said the gunman checked the safe but found it empty. He ordered the employees to their knees and told them to count to 10 as he fled, police said.

Authorities released surveillance photos and described the gunman as a black male, in his late 20s, standing 6 feet tall with a thin build and light complexion.