RCW 70.74.280: Malicious explosion of a substance—Penalties.

A person who maliciously, by the explosion of gunpowder or any other explosive substance or material, destroy or damage any building, car, airplane, vessel, common carrier, railroad track, or public utility transmission system or structure is guilty of:

(1) Malicious explosion of a substance in the first degree if the offense is committed with intent to commit a terrorist act. Malicious explosion of a substance in the first degree is a class A felony;

(2) Malicious explosion of a substance in the second degree if the offense is committed under circumstances not amounting to malicious explosion of a substance in the first degree and if thereby the life or safety of a human being is endangered. Malicious explosion of a substance in the second degree is a class A felony;

(3) Malicious explosion of a substance in the third degree if the offense is committed under circumstances not amounting to malicious explosion of a substance in the first or second degree. Malicious explosion of a substance in the third degree is a class B felony.