Lancashire Fire said in a tweet units were called to a row of terraced houses on Mallowdale Avenue in the early hours of Sunday and that firefighters are searching a collapsed property.
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Lancaster City Council said that Salt Ayre Leisure Centre, in nearby Morecambe, was open as an evacuation centre for any residents who had been affected by the incident.
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Resident Susan Faulkner, 74, who lives further down Mallowdale Avenue, said the blast was “like a bomb going off” and that she was still “shaken” by the incident.
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“I woke up with this huge bang and I thought someone was breaking into my house,” she told the PA news agency.
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