Mo. Rev. Stat. § 574.125: Making a terrorist threat, third degree — penalty.

1. A person commits the offense of making a terrorist threat in the third degree if he or she, with criminal negligence with regard to the risk of causing the evacuation, quarantine or closure of any portion of a building, inhabitable structure, place of assembly or facility of transportation, knowingly:

(1) Communicates an express or implied threat to cause an incident or condition involving danger to life; or

(2) Communicates a knowingly false report of an incident or condition involving danger to life; or

(3) Causes a false belief or fear that an incident has occurred or that a condition exists involving danger to life.

2. The offense of making a terrorist threat in the third degree is a class A misdemeanor.

3. No offense is committed under this section by a person acting in good faith with the purpose to prevent harm.