Several people were killed and others wounded when a construction crane collapsed in downtown Seattle, pinning cars underneath. The crane at the South Lake Union project collapsed on Mercer Street near Interstate 5 shortly before 3.30pm and crushed six cars below, according to the Seattle Fire Department.
Emergency crews work at the scene of a construction crane collapse on Saturday in Seattle.
Among them is a 25-year-old mother and her child, who is less than a year old.
Ms Gregg added a 28-year-old man is also being evaluated for non-life-threatening injuries at the centre.
"My heart goes out to the family and friends of the four people who died in this awful accident", he wrote.
The university says Wong was in a auto when the crane fell from a building under construction on Google's new Seattle campus onto Mercer Street Saturday afternoon.
The road impacted has been blocked off from the public, motorists are being asked to avoid the area. A mother and her infant were released from the hospital Saturday.
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Seattle has been a magnet for tech companies like Amazon and Google and many others who have built their offices there, turning the city into a giant construction ground.
Seattle had 60 construction cranes as of January, more than in any American city.
"It was terrifying", Ms Esther Nelson, a biotech research assistant who was working in a building nearby, told the paper.
The falling crane, which had been situated on top of a building, damaged multiple cars, the department said.
The office building the crane fell from was badly damaged, with several of its windows smashed. "The other half fell down on the street, crossing both lanes of traffic", The Seattle Times reported, citing a witness. Police and the state Department of Labour and Industries were investigating, which Ms Durkan said could take months. Seattle firefighters searched and evacuated the building.
Mercer Street is expected to be closed until Monday morning as crews work to fix damage to the road.