A plainclothes police officer reacts as riot police stand guard in front of the courthouse in Istanbul December 20, 2013. Turkish police arrested eight people in connection with allegations of official corruption and bribery, a newspaper said on Friday, in an investigation Prime Minister Tayyip Erdogan has called a “dirty operation” aimed at undermining his rule. REUTERS/Osman Orsal (TURKEY – Tags: POLITICS CRIME LAW)