WALNUT CREEK, Calif. (AP) — Butane gas from a hash-oil operation caused an explosion that left two men critically burned and another missing and forced dozens to evacuate at a San Francisco Bay Area apartment complex, police said. "We're investigating a drug-extraction lab that used various chemicals," Lt. Tom Cashion told the Contra Costa Times. Lori Meyers, a witness who works in an office building about a quarter mile away, said she felt a jolt. "A bunch of people thought it was an earthquake. But it was a harder and faster hit than that," she said. "To me, it felt like a car hit the building." Bob Grossman, who lives nearby, said he arrived at the scene to find flames 20 to 30 feet in...
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