Metro

Worker falls 6 floors at Commonwealth Ave. construction site

A worker suffered life-threatening injuries in Allston Wednesday morning after falling from a lift at a construction site on Commonwealth Avenue, officials said.

The man, 47, of Nashua, N.H., fell 50 to 60 feet, a witness told police. He was not identified.

Officer Rachel McGuire, a Boston police spokeswoman, said the man was transported to Massachusetts General Hospital.

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The incident occurred at 1047 Commonwealth Ave. Police responded at approximately 6:20 a.m., McGuire said.

Additional details were not available Wednesday.

Rachel Riley can be reached at rachel.riley@globe.com. Follow her on Twitter @rachel_m_riley. Sarah Roberts can be reached atsarah.roberts@globe.com. Follow her on Twitter @heysarahroberts.