Islamic State inmates have taken two prison officers hostage at a jail in the southern Russian city of Rostov, the prison services announced Sunday. “The inmates took two prison officers hostage” in Detention Center Number One of the Rostov region, prison authorities said in a statement. “Negotiations on the release of the hostages are underway,” it added. The state-run TASS news agency, citing an anonymous law enforcement source, reported that IS members who are due to appear in court on terrorism charges are among the hostage takers. Russia has been the target of several attacks claimed by t…