The accident occurred at this Route 410 overpass in Bonney Lake, Washington. Photo from Bonney Lake Police Department / Twitter

A construction firm owned by the Nisqually Tribe of Washington is facing scrutiny after a fatal accident on Monday.

Crews from WHH Nisqually Federal Services were working on a $1.8 million sidewalk project when a concrete wall fell from a highway overpass. Three people -- who were identified by local news reports as a young couple and their infant son -- were killed.

"It's an unfortunate accident," WHH Nisqually general manager Jon Kirk told KOMO. "And, it's under investigation. That's all I can say at this time."

WHH Nisqually was awarded the contract in December, The Tacoma News-Tribune reported. The firm also has a contract for another transportation project, KOMO reported.

WHH Nisqually has no reported violations or issues. But a subcontractor that was hired for the sidewalk project was cited by the state in 2012 for "serious" violations on a different project, KOMO reported.

The road where the accident occurred was closed and has since reopened.

Get the Story:
Mother, father, and infant killed after concrete wall falls from overpass in Bonney Lake (The Tacoma News-Tribune 4/14)
Couple, infant killed by concrete, debris falling from Highway 410 (KIRO 4/14)
SR-410 bridge subcontractor had previous citations (KOMO 4/13)