Workers with the Bonney Lake Public Works Department set up signs on April 13, 2015 in Bonney Lake, Wash.
David Montesino—AP
April 14, 2015 10:07 AM EDT

A couple in their 20s and their baby son were killed when a concrete slab from a sidewalk construction project fell from a bridge onto their truck in Washington state, police said Monday night.

Police in Bonney Lake, about 15 miles southeast of Tacoma, said a contractor was working on a section of the permanent bridge barrier on State Route 410 when the entire approximately 80- to 100-foot section detached and fell Monday morning.

“It was immediately clear to all the first responders that arrived on scene that it was an unsurvivable event,” Bonney Lake Police Officer Todd Green said.

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