An automatic weapon may have been used in a robbery early Monday in Northeast Washington, according to a brief, preliminary police account.

Police said in a twitter message that a robbery was carried out about 1 a.m. in the 3500 block of Commodore Joshua Barney Drive, a residential street in the Fort Lincoln area.

The preliminary report indicated that five or six robbers were involved, and apparently fled in a car. It said they may have been carrying what was described as a machine gun.

The accuracy of that description could not be immediately confirmed early Monday.

Semi-automatic weapons, which are more common, are sometimes confused with those which are fully automatic, such as machine guns. There was no report that any shots were fired. Use of a machine gun in a street robbery would be highly unusual.