Update:Huge Pottstown house explosion in Pennsylvania leaves 4 dead, 2 injured

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Firefighters and emergency crews rushed to the scene around 8:00 p.m. local time

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The explosion happened in the 400 block of Hale Street, destroying at least one house

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Pottstown Borough Manager Justin Keller confirmed the fatalities during a press conference

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Resident Christian Gonzalez told ABC News Philadelphia station WPVI he initially thought the explosion was thunder

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Police have not identified the victims yet. Pottstown is located about 40 miles northwest of Philadelphia

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Two additional people may be unaccounted for, Pottstown Borough Manager Justin Keller said

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Montgomery County officials said they believe a gas leak may have caused the house to explode

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