(CNN) Four people were killed Saturday when a crane collapsed and fell from the roof of a building onto vehicles in the street below, Seattle authorities said.

Two of the dead were crane operators and two were in cars smashed by the crane, Seattle Fire Chief Harold Scoggins said at a news conference.

The victims included three males and one female, Fire Department spokesman Lance Garland said. Three others, including a 4-month-old, were taken to a hospital for treatment of non-life-threatening injuries, Garland said.

The crane smashed six cars when it fell, according to Scoggins.

While referring to the incident as "a tragic day in Seattle," Mayor Jenny Durkan said in a statement, "We also saw some miracles, including a mother and her young child whose car was struck by the crane but survived."

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