COMMERCE CITY, Colo. (CBS4)– Suncor said a clay-like material shot into the air from its oil refinery and landed on cars in the area on Wednesday. That material is nonhazardous, according to Suncor.

Suncor in Commerce City

Copter4 flew over Suncor in Commerce City. (credit: CBS)

The refinery said it happened because of an operational problem.

Two nearby schools had to shelter in place when an alarm went off at the plant in Commerce City.

Suncor in Commerce City

(credit: CBS)

Suncor is paying for people to get their cars washed if they have that dust on their vehicles.