The CIA tracked down and arrested two Russian students within days of them making terrorist threats on the internet.

The Russian Government confirmed that the students from Barnaul had been arrested for making the threats.
A Ukranian organisation called the Computer Crime Research Center said that the students sent an email to the CIA's web site on February 26, threatening to explode a bomb on a US subway.
CIA officials are reported to have swung into action immediately,
working with their counterparts in Russia, Department K for Internal
Affairs, in the Altai region, and the students were arrested in a
matter of days.
Russian media reports said that the students face up to three years in jail for breaking Article 207 of the Russian criminal code.