An explosion at a spa manufacturing factory blew a 20x20 foot hole in the roof of a Vista business around 10:30 p.m. Thursday.
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The explosion occurred inside a container at Watkins Manufacturing Inc., located at 1280 Park Center Drive.
According to 10News, investigators aren't sure what caused the explosion, but the 8,000 gallon container filled with chemicals was cleaned early Thursday and it was that container that exploded late Thursday night.
When Carlsbad and Vista fire units arrived, they had toxic smoke wafting from the remains of the building, as well as water running from the building to a storm drain at 100 gallons per minute.
Fire officials called Camp Pendleton HAZMAT, as well as San Diego County Health, and then pulled their units across the street to a safe distance fearing another explosion.
No one was inside the building at the time and no injuries were reported.
San Diego Sheriffs deputies closed off the street, but according to 10News, the area was reopened by 2:00 a.m. Friday.
The plant isn't expected to be fully operational until Tuesday.
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