Pittsburgh (WPXI) — Authorities say one woman died in an unthinkable construction accident Friday morning in Pittsburgh.

Officials say the initial investigation indicates a large metal drum escaped a nearby construction site, rolled down the hill, broke through fencing and hit the woman on the sidewalk.

When medics arrived, the woman was pronounced dead at the scene.

Public safety officials say the metal cylinder weighs at least one ton.

According to a public safety official, the woman was a staff member at one of the local hospitals and was with one or two co-workers when she was hit.

The deadly incident remains under investigation.

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