University Police advised students to “be alert and report any suspicious activity” after a shooting spree in Maryland, Virginia and D.C. that left six dead and one wounded late last week.

UPD placed notices in residence halls Thursday informing students about the case, in which five people were shot to death at random in Montgomery County, Md. during a 16-hour span Wednesday and Thursday. A sixth victim was killed Thursday in the District.

Police are seeking two men in a white “box-like corporate delivery truck” with black lettering on the side of the vehicle and damage to the rear.

The UPD alert said there are “no indications the vehicle is on or near GW campuses.”

The gunman randomly shot victims from more than 100 yards away with a high-powered rifle. Police are investigating a series of suspicious shootings as far away as Fredericksburg, Va. that may be connected with the Montgomery County killings.

-Alex Kingsbury