ATHENS, GREECE - APR 16, 2015: Leftist and anarchist groups seeking the abolition of new maximum security prisons, clashed with riot police, who responded with tear gas and stun grenades.

Editorial Use Only: This image can only be used for editorial purpose. Use of this image in advertising, commercial or for promotional purposes is prohibited unless additional clearances are secured by the licensee. 123RF.com does not provide any clearance services.