Fitchburg police are trying to determine who fired the shot which sent a bullet into a house Monday morning, narrowly missing the people inside. The incident was reported to police at about 11:15 a-m. The stray bullet passed through an exterior wall, then through the headboard of a bed where a mother and her child were sleeping. It was found in an interior wall. Nobody was hit and no injuries have been reported. Investigators say they don’t have a suspect yet.