$1M damage in Mukilteo propane tank explosion

The fire department estimates property damage at $1 million from a propane tank explosion during construction work at a water treatment plant near Mukilteo. Snohomish County Fire District 1 says the explosion Thursday left a 300-foot blast zone that damaged two buildings, building materials and a truck and trailer. Five inured people were taken to Harborview Medical Center in Seattle. One was treated and released; three were in satisfactory condition Thursday night, and one critical.