(Masked Sunni Muslim gunmen take their positions with their weapons during a patrol in Ramadi, 100 km (62 miles) west of Baghdad, January 28, 2014. Iraqi government forces battling al Qaeda-linked militants intensified air strikes and artillery fire on the Sunni city of Ramadi on Monday in a military operation that killed at least 20 ISIL militants in the eastern part of the city, Ministry of Defence said. REUTERS/Stringer )

(Masked Sunni Muslim gunmen take their positions with their weapons during a patrol in Ramadi, 100 km (62 miles) west of Baghdad, January 28, 2014. REUTERS/Stringer )