PITTSBURGH —

One person remains unaccounted for after a massive fire broke out inside a building in Pittsburgh's Sheraden neighborhood early Saturday morning.

Pittsburgh police and fire responded to a 2-alarm structure fire in the 700 block of Hillsboro Street just after midnight. Advertisement

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Officials said when they arrived on the scene, flames were seen coming from the second floor of the building. As firefighters worked to contain the fire, they said the building partially collapsed, causing the roof and third floor to fall onto the second floor of the structure.

A man was believed to be inside the building at the time of the fire. Police said he remains unaccounted for.

Police utilized drones to assist in the search and rescue, but were

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