SAN FRANCISCO (AP) — A San Francisco woman is accused of having a suspected drug lab in her apartment that exploded and injured her and a 12-year-old boy.

Police arrested 33-year-old Angelic Cisneros on Wednesday on suspicion of recklessly causing a fire, possession of marijuana for sale and child endangerment.

The explosion happened Tuesday night in the Ingleside neighborhood, and blew out three front windows of the ground-floor apartment unit.

Sgt. Daryl Fong says it was likely caused when butane was used in an attempt to make drugs. He did not say what kind of drugs was being manufactured.

Fong also would not say whether the boy is related to Cisneros. Cisneros was treated and released from the hospital, but the child remains hospitalized with non-life-threatening injuries.