Investigators have collected evidence from the Rugby Avenue home and the apartment complex, police said. A dump bin from Barracks West also has been removed from the complex and is being searched for evidence, authorities said.

The Aldridge house, which police still consider an active crime scene, is under constant surveillance. While some neighbors are voicing fears for their safety, Longo would not specify at the conference whether the mother and daughter could have been the victims of random violence.

“We have our own theory of the case, but we don’t have sufficient evidence to determine one way or another whether it is [random] or not,” Longo said at the conference. “If we, at any time in this investigation, develop information that would lead us to believe this was a random act, we would be very aggressive at reporting that back to the community … and take whatever precautions necessary to make them and their families safe.”

Authorities also have distributed stock photos of a Nike shoe with black and orange coloring that Longo said is believed to be the type worn by someone with knowledge of what happened in the home “based on its proximity to other items we believe are of evidentiary value.” Police would not say Monday night whether Washington was seen wearing those shoes.