Palestinians carry the bodies of two of three Hamas militants who were killed in an explosion, during their funeral in the Al-Nusairat refugee camp, in central Gaza Strip on April 16, 2014. The militants were killed Wednesday in a vague blast taking place at a training camp belonging to Hamas's armed wing the Ezzedine al-Qassam Brigades in southern Gaza Strip city of Khan Younis, medical sources and Witnesses said. (Xinhua/Khaled Omar)

A Palestinian relative of one of three Hamas militants who were killed in an explosion mourns during their funeral in the Al-Nusairat refugee camp, in central Gaza Strip on April 16, 2014. The militants were killed Wednesday in a vague blast taking place at a training camp belonging to Hamas's armed wing the Ezzedine al-Qassam Brigades in southern Gaza Strip city of Khan Younis, medical sources and Witnesses said. (Xinhua/Khaled Omar)

Palestinians carry the body of one of three Hamas militants who were killed in an explosion, during their funeral in the Al-Nusairat refugee camp, in central Gaza Strip on April 16, 2014. The militants were killed Wednesday in a vague blast taking place at a training camp belonging to Hamas's armed wing the Ezzedine al-Qassam Brigades in southern Gaza Strip city of Khan Younis, medical sources and Witnesses said. (Xinhua/Khaled Omar)

Palestinians carry the bodies of two of three Hamas militants who were killed in an explosion, during their funeral in the Al-Nusairat refugee camp, in central Gaza Strip on April 16, 2014. The militants were killed Wednesday in a vague blast taking place at a training camp belonging to Hamas's armed wing the Ezzedine al-Qassam Brigades in southern Gaza Strip city of Khan Younis, medical sources and Witnesses said. (Xinhua/Khaled Omar)