Lancashire Police said they were called to the scene of the explosion in Heysham at 2.40am on Sunday after reports that “a number” of houses on Mallowdale Avenue had collapsed.
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Several residents of the area tweeted that up to three houses had collapsed, and emergency services sirens had been heard near the scene for a prolonged time.
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“A major incident has been declared after we (were) called to terraced houses on Mallowdale Avenue. It has been reported that there has been an explosion at a property and firefighters are searching the collapsed property,” it said.
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Lancashire Fire said on Twitter that 10 units were called to the terraced row and firefighters were searching a collapsed property.
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Dan Knowles, who lives four streets away from the explosion, said he thought there had been an earthquake.