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LAKE ELSINORE, Calif. — A Southern California man who blew off four fingers while mixing explosives in a home that doubled as a day-care center had made a volatile compound similar to the one used in the 2005 London subway bombings, a sheriff’s official said.

Benjamin Kuzelka, 23, made triacetone triperoxide and was in the garage handling an unstable liquid when it exploded, Sgt. Pat Chavez told the Riverside Press-Enterprise in a story published Friday.

Chavez said there was no indication of any link to terrorism. He said Kuzelka told investigators he had researched bomb-making online and was trying it at home for fun.