Opposition activist Mark Halperin, detained on Tuesday in the morning, was released for freedom after interrogation and is in the status of a witness. This was announced by his lawyer Ksenia Kostromina. Reportedly, a non -disclosure subscription was taken from the activist. In which case, Halperin is a witness - it is still unclear. Information that a criminal case for "extremist calls" had been instituted against him was not yet confirmed. Halperin was detained on Tuesday morning FSB officers. He and a number of other activists had searches. In addition to Halperin, the journalist of the video project "degrees" Olga Sapronova was taken to the Lubyanka. Single pickets in support of Halperin had a FSB building on Lubyanka. About five people participated in the pickets, including the leader of the Moscow "apple" Sergey Mitrokhin. The arrivals demanded the liberation of the opposition. The police did not interfere.