BC-CA--USC Explosion,1st Ld-Writethru/83
No injuries as student causes chemical blast at USC

LOS ANGELES (AP) — The Los Angeles Fire Department says a student mixing chemicals caused a small explosion in a classroom at the University of Southern California.

Fire officials say no one was injured in the Tuesday night blast in the basement of the five-story classroom building on USC's main campus.

No fire broke out and no structural damage was caused at Ronald Tutor Hall.

It did force the evacuation of the building, which firefighters checked for a possible methane gas leak.

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