Angelic Cisneros, 33, was arrested Wednesday for the blast, which was reported at 8:50 p.m. Tuesday at 1228 Capitol Ave., near Ocean Avenue.
The blast caused a small fire, but by the time firefighters arrived, the blaze was nearly out. Firefighters called police when they suspected that the explosion might have been drug-related.
Police investigators arrived and determined that a butane tank had exploded as drugs were allegedly being manufactured, police spokesman Sgt. Daryl Fong said.
After the explosion, Cisneros and the 12-year-old boy transported themselves to a hospital to be treated for burn injuries. The injuries are not considered life-threatening, but the boy remained at the hospital Wednesday night, Fong said.
When Cisneros was released from the hospital, police took her into custody and booked her into jail on suspicion of recklessly causing a fire that caused bodily injury, recklessly causing a fire in an inhabited dwelling, two counts of child endangerment and possession of marijuana for sale, Fong said.