An Armenian serviceman in a tank looks on as police block the streets to Erebuni police station in Yerevan on July 17, 2016.An armed group with links to an imprisoned opposition leader on July 17, 2016 seized a police building in Yerevan and took hostages, the national security service said. On July 17, 2016 morning "a group of armed men entered the premises of a police regiment in Yerevan and is holding hostages under the threat of violence," Armenia's National Security Service said in a statement, while one of the gunmen said the hostages included the country's deputy police chief.[Photo/VCG]