Smoke rises following what witnesses said was an Israeli air strike in Gaza August 21, 2014. An Israeli air strike killed three senior Hamas military commanders in the Gaza Strip on Thursday, the Islamist group said, the clearest sign yet Israel is focusing its assault on those leading attacks from the Palestinian enclave. The Israeli military had no immediate comment on what would constitute the killing of the most senior Hamas men since it launched its offensive on Gaza six week ago with the declared aim of curbing rocket fire into its territory. Hamas, which dominates the Gaza Strip, named the men as Mohammed Abu Shammala, Raed al-Attar and Mohammed Barhoum and said they were killed in a bombing of a house in the southern town of Rafah. REUTERS/Ahmed Zakot (GAZA – Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY MILITARY CONFLICT)