Palestinians gather at the site of an explosion that ripped through a house in the Al-Shabura refugee camp near the southern Gaza Strip town of Rafah on August 6, 2015. An explosion killed four Palestinians and wounded 30 on Thursday in the southern Gaza town of Rafah along the Egyptian border, medical officials and local residents said. Media outlets of the Hamas Islamist group that controls the Gaza Strip blamed the blast on an unexploded Israeli missile from last year's war. The Hamas-run Interior Ministry said it was checking the cause of the explosion, which destroyed the home of Ayman Abu Nqeira, a Hamas member. Photo by Abed Rahim Khatib/ Flash90

Palestinians gather at the site of an explosion that ripped through a house in the Al-Shabura refugee camp near the southern Gaza Strip town of Rafah on August 6, 2015. An explosion killed four Palestinians and wounded 30 on Thursday in the southern Gaza town of Rafah along the Egyptian border, medical officials and local residents said. Media outlets of the Hamas Islamist group that controls the Gaza Strip blamed the blast on an unexploded Israeli missile from last year's war. The Hamas-run Interior Ministry said it was checking the cause of the explosion, which destroyed the home of Ayman Abu Nqeira, a Hamas member. Photo by Abed Rahim Khatib/ Flash90

Palestinian police secure the area following an explosion that ripped through a house in the Al-Shabura refugee camp near the southern Gaza Strip town of Rafah on August 6, 2015. An explosion killed four Palestinians and wounded 30 on Thursday in the southern Gaza town of Rafah along the Egyptian border, medical officials and local residents said. Media outlets of the Hamas Islamist group that controls the Gaza Strip blamed the blast on an unexploded Israeli missile from last year's war. The Hamas-run Interior Ministry said it was checking the cause of the explosion, which destroyed the home of Ayman Abu Nqeira, a Hamas member. Photo by Abed Rahim Khatib/ Flash90

Members of the Ezzedine al-Qassam brigades, the armed wing of the Hamas movement, secure the area following an explosion that ripped through a house in the Al-Shabura refugee camp near the southern Gaza Strip town of Rafah on August 6, 2015. An explosion killed four Palestinians and wounded 30 on Thursday in the southern Gaza town of Rafah along the Egyptian border, medical officials and local residents said. Media outlets of the Hamas Islamist group that controls the Gaza Strip blamed the blast on an unexploded Israeli missile from last year's war. The Hamas-run Interior Ministry said it was checking the cause of the explosion, which destroyed the home of Ayman Abu Nqeira, a Hamas member. Photo by Abed Rahim Khatib/ Flash90

Palestinians gather at the site of an explosion that ripped through a house in the Al-Shabura refugee camp near the southern Gaza Strip town of Rafah on August 6, 2015. An explosion killed four Palestinians and wounded 30 on Thursday in the southern Gaza town of Rafah along the Egyptian border, medical officials and local residents said. Media outlets of the Hamas Islamist group that controls the Gaza Strip blamed the blast on an unexploded Israeli missile from last year's war. The Hamas-run Interior Ministry said it was checking the cause of the explosion, which destroyed the home of Ayman Abu Nqeira, a Hamas member. Photo by Abed Rahim Khatib/ Flash90

Palestinian man are treated at a hospital in the southern Gaza Strip town of Rafah following an explosion that ripped through a house in the nearby Al-Shabura refugee camp on August 6, 2015. An explosion killed four Palestinians and wounded 30 on Thursday in the southern Gaza town of Rafah along the Egyptian border, medical officials and local residents said. Media outlets of the Hamas Islamist group that controls the Gaza Strip blamed the blast on an unexploded Israeli missile from last year's war. The Hamas-run Interior Ministry said it was checking the cause of the explosion, which destroyed the home of Ayman Abu Nqeira, a Hamas member. Photo by Abed Rahim Khatib/ Flash90

Palestinian boy are treated at a hospital in the southern Gaza Strip town of Rafah following an explosion that ripped through a house in the nearby Al-Shabura refugee camp on August 6, 2015. An explosion killed four Palestinians and wounded 30 on Thursday in the southern Gaza town of Rafah along the Egyptian border, medical officials and local residents said. Media outlets of the Hamas Islamist group that controls the Gaza Strip blamed the blast on an unexploded Israeli missile from last year's war. The Hamas-run Interior Ministry said it was checking the cause of the explosion, which destroyed the home of Ayman Abu Nqeira, a Hamas member. Photo by Abed Rahim Khatib/ Flash90

A Palestinian man stands next to four bodies lying at the morgue in the southern Gaza Strip town of Rafah following an explosion that ripped through a house in the nearby Al-Shabura refugee camp on August 6, 2015. An explosion killed four Palestinians and wounded 30 on Thursday in the southern Gaza town of Rafah along the Egyptian border, medical officials and local residents said. Media outlets of the Hamas Islamist group that controls the Gaza Strip blamed the blast on an unexploded Israeli missile from last year's war. The Hamas-run Interior Ministry said it was checking the cause of the explosion, which destroyed the home of Ayman Abu Nqeira, a Hamas member. Photo by Abed Rahim Khatib/ Flash90

Palestinians carry the bodies of members of Abu Nqeira family, who were killed in an explosion, during their funeral in Rafah in the southern Gaza Strip, on August 6, 2015. An explosion killed four Palestinians and wounded 30 on Thursday in the southern Gaza town of Rafah along the Egyptian border, medical officials and local residents said. Media outlets of the Hamas Islamist group that controls the Gaza Strip blamed the blast on an unexploded Israeli missile from last year's war. The Hamas-run Interior Ministry said it was checking the cause of the explosion, which destroyed the home of Ayman Abu Nqeira, a Hamas member. Photo by Abed Rahim Khatib/ Flash90

Palestinians carry the bodies of members of Abu Nqeira family, who were killed in an explosion, during their funeral in Rafah in the southern Gaza Strip, on August 6, 2015. An explosion killed four Palestinians and wounded 30 on Thursday in the southern Gaza town of Rafah along the Egyptian border, medical officials and local residents said. Media outlets of the Hamas Islamist group that controls the Gaza Strip blamed the blast on an unexploded Israeli missile from last year's war. The Hamas-run Interior Ministry said it was checking the cause of the explosion, which destroyed the home of Ayman Abu Nqeira, a Hamas member. Photo by Abed Rahim Khatib/ Flash90

Palestinians carry the bodies of members of Abu Nqeira family, who were killed in an explosion, during their funeral in Rafah in the southern Gaza Strip, on August 6, 2015. An explosion killed four Palestinians and wounded 30 on Thursday in the southern Gaza town of Rafah along the Egyptian border, medical officials and local residents said. Media outlets of the Hamas Islamist group that controls the Gaza Strip blamed the blast on an unexploded Israeli missile from last year's war. The Hamas-run Interior Ministry said it was checking the cause of the explosion, which destroyed the home of Ayman Abu Nqeira, a Hamas member. Photo by Abed Rahim Khatib/ Flash90

Palestinians carry the bodies of members of Abu Nqeira family, who were killed in an explosion, during their funeral in Rafah in the southern Gaza Strip, on August 6, 2015. An explosion killed four Palestinians and wounded 30 on Thursday in the southern Gaza town of Rafah along the Egyptian border, medical officials and local residents said. Media outlets of the Hamas Islamist group that controls the Gaza Strip blamed the blast on an unexploded Israeli missile from last year's war. The Hamas-run Interior Ministry said it was checking the cause of the explosion, which destroyed the home of Ayman Abu Nqeira, a Hamas member. Photo by Abed Rahim Khatib/ Flash90

A relatives of the Palestinian Hamas militant Abdulrahman Abu Nqeira, who was killed in an explosion, mourns during his funeral in Rafah in the southern Gaza Strip August 6, 2015. An explosion killed four Palestinians and wounded 30 on Thursday in the southern Gaza town of Rafah along the Egyptian border, medical officials and local residents said. Media outlets of the Hamas Islamist group that controls the Gaza Strip blamed the blast on an unexploded Israeli missile from last year's war. The Hamas-run Interior Ministry said it was checking the cause of the explosion, which destroyed the home of Ayman Abu Nqeira, a Hamas member. Photo by Abed Rahim Khatib/ Flash90

A relatives of the Palestinian Hamas militant Abdulrahman Abu Nqeira, who was killed in an explosion, mourns during his funeral in Rafah in the southern Gaza Strip August 6, 2015. An explosion killed four Palestinians and wounded 30 on Thursday in the southern Gaza town of Rafah along the Egyptian border, medical officials and local residents said. Media outlets of the Hamas Islamist group that controls the Gaza Strip blamed the blast on an unexploded Israeli missile from last year's war. The Hamas-run Interior Ministry said it was checking the cause of the explosion, which destroyed the home of Ayman Abu Nqeira, a Hamas member. Photo by Abed Rahim Khatib/ Flash90

A relatives of the Palestinian Hamas militant Abdulrahman Abu Nqeira, who was killed in an explosion, mourns during his funeral in Rafah in the southern Gaza Strip August 6, 2015. An explosion killed four Palestinians and wounded 30 on Thursday in the southern Gaza town of Rafah along the Egyptian border, medical officials and local residents said. Media outlets of the Hamas Islamist group that controls the Gaza Strip blamed the blast on an unexploded Israeli missile from last year's war. The Hamas-run Interior Ministry said it was checking the cause of the explosion, which destroyed the home of Ayman Abu Nqeira, a Hamas member. Photo by Abed Rahim Khatib/ Flash90