Authorities are investigating an explosion at a Pacific Beach apartment building.
The incident happened just before 7 p.m. Tuesday in the 2100-block of Grand Avenue. The explosion apparently came from top level of the two-story building.
One person was taken to the UCSD Medical Center with serious burns and life threatening injuries, according to fire officials.
Officials said the explosion appears to be drug-related, possibly the result of a growing operation.
Fire and Hazmat crews both responded.
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