NEWPORT: Authorities in the northeast Washington community of Newport say an explosion at an Aerospace plant injured five people Tuesday night.

KXLY-TV of Spokane reports (http://is.gd/fMzaDs ) the Pend Oreille County undersheriff says two of the five have been airlifted to Sacred Heart Medical Center in Spokane. There was no immediate detail on the nature of the injuries.

The sheriff's dispatch office says the first calls about the explosion came in just before 9 p.m. PDT.

Neighbors say the blast rattled windows on their homes. KXLY says witnesses report a nearby apartment building and fast food restaurant were evacuated.

The cause of the explosion was not immediately known.

Zodiac Aerospace reportedly makes aircraft interiors at the Newport facility. A call to the plant rang unanswered late Tuesday night.