Fire officials confirmed Monday that gas was the source of an early morning house explosion Sunday.
"It has been confirmed to be a gas explosion and the cause is not determined yet," said Fire Chief James Fortin.
The exact cause of the explosion that left one person injured is still being investigated by the State Fire Marshal's Office, he said. Details on the condition of the victim were not available.
"The person that was involved, the victim, is still at UMass with an unknown condition," said Chief Fortin.
At 1:04 a.m. on Sunday morning, multiple 911 calls were received alerting the Marlborough Fire Department to a house explosion at 15 Grant Ct. Neighbors reported feeling the explosion which left the house's walls blown out and the structure on fire.
Fire crews left the area at 4:37 a.m.
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