Sioux Falls Police have a reminder for residents to lock their doors.

Officers are investigating three burglaries in the northeast part of the city that they say appear related.  In each case, the homes have been unlocked, and the burglars are entering at some point in the evening into the night time hours.

In one case, a homeowner said they witnessed two black men enter a home and then run without taking anything. That person described the suspects as being in their late teens or early twenties, five foot ten to six foot tall and thin builds.

If you see suspicious activity, police say to give them a call.