Tamerlan Tsarnaev has been in a shootout with the Boston police.
Tsarnaev first came to the attention of Russian security forces in December 2010 when William Plotnikov was briefly detained in Dagestan and forced to disclose his social networking contacts in North America with ties to Russia
 According to Novaya Gazeta, Tsarnaev had sought to join the local insurgency, and was put on a period of 'quarantine'  a clearance check by insurgents looking for infiltrating double agents, taking several months for a recruit to be verified

