What started out as an investigation into the source of a possible gas leak took a dark turn, as two bodies were found in an apartment on California Street Wednesday evening.

Police could not immediately release any details about the two victims who were found by a hazardous materials team searching a building that was evacuated following a call at 6:09 p.m. on Sept. 24 reporting a noxious smell.

Four Mountain View police officers investigating the possible hazardous materials incident at 2025 California St. were sickened by a strong, noxious odor, said Shino Tanaka, spokeswoman for the police department. Residents of one adjacent building, at 2017 California St., were evacuated, due to the direction the wind was carrying the fumes, and residents of another nearby building at 2035 California St. were advised to shelter in place until the fumes dissipated, Tanaka said.

"It smells like a rotten egg," Mountain View fire spokesman Lynn Brown said.

Pacific Gas & Electric crews shut off gas lines in the area, but there was no immediate indication of what might have caused a gas leak, Tanaka said. The cause is under investigation by police.

"The indication is that it was gas. Once it was shut off, it did clear, and (the fumes) didn't strengthen," she said.

Tanaka said there was no exact count of the number of apartments affected, but that approximately 30 to 40 evacuees had gathered in the community center at 201 S. Rengstorff Ave. where the American Red Cross was offering assistance.

The four police officers sickened from the fumes reported feeling lightheaded, Tanaka said. They were treated and released.

Residents were allowed back into their buildings around 8 a.m. Thursday morning. The affected portion of California Street was still filled with emergency vehicles and closed to traffic Wednesday night.

Bay City News Service contributed to this report.