By CBS3 Staff

KING OF PRUSSIA, Pa. (CBS) — At least one person was seriously injured in an elevator accident at a King of Prussia apartment building Monday night. Chopper 3 was over the building at 251 West Dekalb Pike.

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Authorities say the elevator dropped several floors with three people inside at the time. Rescue teams initially rescued one person who was suffering from a broken leg.

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Two others were then rescued, according to officials, including one person who was suffering from serious injuries.

There is no word on what caused the elevator to drop.

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Stay with CBSPhilly.com for updates on this developing story.