CHARLOTTE, N.C. (AP) – Authorities say a fire caused a house in North Carolina’s largest city to explode, injuring at least two people.

In a tweet, the Charlotte Fire Department says a fire caused the house to explode Tuesday afternoon. The department also tweeted that a rescue was under way and that it had sounded a fourth alarm for more help.

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Charlotte Medic told news outlets two people living in surrounding homes were being evaluated for injuries that aren’t life-threatening.

News outlets report that flames and smoke were coming from the rubble.

Nearby resident Paul Aarons tells The Charlotte Observer his entire house shook and he heard a massive boom. The boom seemed so close that he thought someone was driving into his garage.

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