It happened at 4 p.m. in a three-story science building on 923 Bloom Walk. Los Angeles firefighters said. One person - who was not identified - was sent to the hospital in an unknown condition.
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Firefighters evacuated everyone from the building. Investigators said crews checked every floor in the building and found no hazards or leaks. They said all air readings (conducted via a handheld gas meter) came out normal.
No other injuries reported. Both buildings have since been reopened.
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Investigators are still working to figure out what exactly caused the explosion.