BALTIMORE (AP) — A natural gas explosion has leveled three row houses in Baltimore, killing a woman and trapping others.

Four people have been hospitalized with serious injuries, and rescuers are trying to reach at least one more survivor in the wreckage.

A fourth row house was ripped open by the blast, which shattered windows around the neighborhood.

The Baltimore Gas and Electric Co. was called in to shut off gas around the immediate vicinity. The cause of the explosion wasn't immediately clear, but leaky pipes are a growing problem in Baltimore.

The utility estimated that replacing aging pipes would cost nearly $1 billion and take two decades.

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