TRACY (CBS13) – Twenty homes in Tracy were evacuated for over an hour after an explosion went off inside a home.

Tracy fire and police investigators are still trying to piece together the details that led to the blast at the home in the 1300 block of Crossroads Drive at around 3:30 p.m., say Tracy police.

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When firefighters arrived, they found the garage doors and roof tiles from the home scattered in the street.

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Investigators believe the homeowner was trying to commit suicide shortly before the blast. He was badly burned and was taken to the hospital where he is listed in critical condition.

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