By Richard Chang and Bill Lindelof
UC Davis police are conducting a criminal investigation into the Thursday explosion at a campus apartment that left a university researcher injured.
The explosion took place at a Russell Park housing complex unit in the early morning hours. The UC Davis researcher was treated for hand injuries at a hospital.
Police spent Thursday searching the apartment and carefully removing potentially hazardous chemicals. Nearby residents were evacuated, but many were allowed to return in the afternoon.
The remainder of the residents received word today that they could return. Last night, police took some of the chemicals to an open area west of the campus where they were rendered harmless.
Eight detonations could be heard as the chemicals were made safe.
At a press conference held today officials were tight-lipped about the details of the investigation. However, they indicated that the explosion may be more than just an accident.
"This is now a criminal investigation," said University of California, Davis Police Chief Matt Carmichael.
The apartment is is now boarded up.