Explosion heard before apartment bursts into flames

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SAN DIEGO – Flames from the ground level of an apartment complex in Rancho Bernardo were extinguished within 10 minutes, authorities said.

The non-injury blaze in the 11800 block of Caminito Ronaldo erupted for unknown reasons shortly after 12:30 p.m., according to the San Diego Fire- Rescue Department.

The flames originated on a ground-level balcony and spread into the adjacent unit before crews were able to extinguish them, SDFRD spokeswoman Monica Munoz said.

A witness told authorities that an explosion was heard in the area where the fire burned, according to Munoz.

The American Red Cross was called in to help the two adults who live in the apartment arrange for interim lodging.

The cause of the fire was under investigation.