BERKELEY (CBS SF/AP) — Two people were found dead inside their Berkeley apartment on Monday, prompting the building’s evacuation while police investigated the cause of their deaths.

Berkeley police announced shortly after 4 p.m. that the building in the 3000 block of Deakin Street, where the two bodies were discovered, was evacuated to ensure there were no hazardous conditions at the property.

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Two cats were also found dead in the apartment.

“As their cause of death is not immediately apparent, the building has been evacuated out of an abundance of caution,” the Berkeley Police Department announced. The street was also shut down as a precaution.

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Police described the pair’s death as a “suspicious circumstance” and said the Berkeley Fire Department and PG&E personnel were responding to the building.

Deputy Fire Chief Dave Brannigan said firefighters, a Pacific Gas & Electric crew and members of a hazardous-materials team ruled out hazardous causes, including carbon monoxide poisoning.

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