WASHINGTON — (CNN) Two people were killed and at least nine were critically injured when a tour bus and a duck boat tourist vehicle collided Thursday morning in Seattle, the city’s fire department tweeted.

“All patients extricated,” the Seattle Fire Department said.

The department said that about 50 people had been evaluated for injuries after the crash.

A nursing supervisor at Harborview Medical Center in Seattle said that hospital alone is expecting 25 patients with unknown injuries.

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