Hospitalized Boeing Workers Return Home

All of the approximately 120 people who went to hospitals after a toxic chemical reaction at a Boeing Co. plant have returned home, and the complex was back in operation Monday.

Sherry Nebel, a spokeswoman for the fabrications division in this suburb between Seattle and Tacoma, said the cause of the sudden release Friday was still under investigation.

“We know what happened, but not why it happened,” another fabrications spokesman, Tom Koehler, said Saturday.