Thirty persons suffered in terror act in the resort city of Pyatigorsk, Stavropol Territory; terrorist-suicide bomber blows himself up in North-Ossetian-Ingush border, kills a militiaman and wounds three more persons; armed underground of Northern Caucasus loses several of its notable leaders, – look these and other news items in the review of the main events in the Caucasus on August 16-22, 2010, prepared by the "Caucasian Knot".