A giant construction crane operating at the site of a future Google campus collapsed from the roof of a building and toppled across a Seattle intersection on Saturday, killing four people and injuring three others, authorities and local media said.

The crane collapse occurred in Seattle’s South Lake Union neighborhood shortly after 3:30pm local time, crushing five cars and damaging a sixth at the intersection of Fairview Avenue North and Mercer Street, the Seattle Fire Department said.

Three men and a woman were killed. Two of the dead had been working in the crane, and the two others were in separate vehicles struck on the street below, the fire department said in a statement posted online.

Four other individuals were evaluated on the scene by medics and three of them – a 27-year-old man, a 25-year-old woman and a 4-month-old infant girl – were taken to a local hospital with non-life-threatening injuries, the fire department said.

The cause of the crane failure was under investigation by the Washington State Department of Labor and Industries, according to the statement.

Local media, including the Seattle Times, reported that the crane was operating on the construction site of a new multi-building complex being built for Google.

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