There is a massive manhunt underway in Russia for those who were responsible for the Moscow terrorist attack (whoever they may be). If credible Western media sources report that ALL of the terrorists 

 involved in the attack (the shooters themselves) have been taken into custody or killed within 72 hours of this market being created, resolves YES. If there no news regarding the status of all the terrorists within 3 days, resolves NO.

In case of a dispute (for example: Russia claims they killed all the terrorists, but Western sources haven't seen evidence it's true and ISIS denies it), the market close date may be extended beyond 3 days until clarity on the situation is established, but any actions taken outside of those 3 days won't count. So for example if Russia claims they captured the terrorists on day 2, but Western media only confirms it on day 5 (but confirms it happened on day 2), still resolves YES.