Palestinians sit inside the UNRWA school as they flee their houses following an Israeli ground offensive in Rafah in the southern Gaza Strip on July 18, 2014. Israel launched a Gaza ground campaign after 10 days of bombardments from the air and sea failed to stop militants' rocket attacks, stepping up an offensive that already has taken a heavy toll in civilian lives. Gaza residents and medical officials reported heavy shelling along the eastern border from the southern town of Rafah to the north of the strip. Israel signalled the invasion would be limited in scope - targeting tunnels dug by gunmen - and said it was not intended to topple Hamas, the Gaza Strip's dominant Islamist group. Photo by Abed Rahim Khatib/Flash90

Palestinians flee their houses following an Israeli ground offensive in Rafah in the southern Gaza Strip on July 18, 2014. Israel launched a Gaza ground campaign after 10 days of bombardments from the air and sea failed to stop militants' rocket attacks, stepping up an offensive that already has taken a heavy toll in civilian lives. Gaza residents and medical officials reported heavy shelling along the eastern border from the southern town of Rafah to the north of the strip. Israel signalled the invasion would be limited in scope - targeting tunnels dug by gunmen - and said it was not intended to topple Hamas, the Gaza Strip's dominant Islamist group. Photo by Abed Rahim Khatib/Flash90

Palestinians flee their houses following an Israeli ground offensive in Rafah in the southern Gaza Strip on July 18, 2014. Israel launched a Gaza ground campaign after 10 days of bombardments from the air and sea failed to stop militants' rocket attacks, stepping up an offensive that already has taken a heavy toll in civilian lives. Gaza residents and medical officials reported heavy shelling along the eastern border from the southern town of Rafah to the north of the strip. Israel signalled the invasion would be limited in scope - targeting tunnels dug by gunmen - and said it was not intended to topple Hamas, the Gaza Strip's dominant Islamist group. Photo by Abed Rahim Khatib/Flash90

Palestinian mourners gather around the body of five-month-old Fares al-Mahmum during his funeral on July 18, 2014 in Rafah, in the southern Gaza Strip. The infant was one of five people killed by Israeli fire in separate incidents in the southern city, as Israel pressed a ground offensive on the 11th day of a massive operation to stamp out militant rocket fire. Photo by Abed Rahim Khatib/Flash90

Palestinian mourners gather around the body of five-month-old Fares al-Mahmum and another victim of Israeli bombardment during their funeral on July 18, 2014 in Rafah, in the southern Gaza Strip. The infant was one of five people killed by Israeli fire in separate incidents in the southern city, as Israel pressed a ground offensive on the 11th day of a massive operation to stamp out militant rocket fire. Photo by Abed Rahim Khatib/Flash90

Palestinian mourners gather around the body of five-month-old Fares al-Mahmum and another victim of Israeli bombardment during their funeral on July 18, 2014 in Rafah, in the southern Gaza Strip. The infant was one of five people killed by Israeli fire in separate incidents in the southern city, as Israel pressed a ground offensive on the 11th day of a massive operation to stamp out militant rocket fire. Photo by Abed Rahim Khatib/Flash90

Palestinian mourners gather around the body of five-month-old Fares al-Mahmum and another victim of Israeli bombardment during their funeral on July 18, 2014 in Rafah, in the southern Gaza Strip. The infant was one of five people killed by Israeli fire in separate incidents in the southern city, as Israel pressed a ground offensive on the 11th day of a massive operation to stamp out militant rocket fire. Photo by Abed Rahim Khatib/Flash90

Wounded Israeli soldier are wheeled into Soroka hospital in the southern city of Beersheba on July 18, 2014, as Operation Protective Edge has entered its 11th day, with Gaza militants having fired more than 1500 rockets into Israel. The IDF (Israeli Defense Force) began ground operation into Gaza last night. Photo by Flash90