Mo. Rev. Stat. § 574.115: Making a terrorist threat, first degree — penalty.

1. A person commits the offense of making a terrorist threat in the first degree if such person, with the purpose of frightening ten or more people or 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 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 first degree is a class D felony.

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