PhotoBlog - Israeli air strikes kill two Gaza gunmen, 15-year-old schoolboy GRAPHIC WARNING: This post contains graphic images which some viewers may find disturbing. Ibraheem Abu Mustafa / Reuters The parents of a Palestinian militant mourn next to his body at the scene of an Israeli air strike in Khan Younis in the southern Gaza Strip on March 12, 2012. Msnbc.com news services report - Israeli air strikes killed two Palestinian militants and a civilian in the Gaza Strip on Monday in a fourth day of cross-border hostilities, medical sources said. An Islamic Jihad gunman was killed while launching a rocket from south Gaza, the group said. Another died and three others were hurt when their motorized rickshaw was hit. Hamas and hospital officials said a 15-year-old schoolboy was killed in a separate air strike on Monday. The teenager, Nayef Qarmut, was killed while walking to school past an open area, emergency services spokesperson Adham Abu Selmiya told Agence France Presse. At least 28 other Palestinian civilians were wounded in the various incidents. Palestinian attacks have disrupted normal life in southern Israel, forcing many schools to close on Sunday and Monday. Israeli aircraft have flown over Gaza since Friday, killing at least 21 people, including two civilians. A motorized rickshaw lies on its side following an Israeli air strike in Khan Younis on March 12, 2012. Suhaib Salem / Reuters Palestinians walk next to a destroyed building after an Israeli air strike in Jabalya in the northern Gaza Strip on March 12, 2012. Mohammed Abed / AFP - Getty Images A wounded Palestinian child receives medical atttention at a hospital in Beit Lahia in the northern Gaza Strip on March 12, 2012, following an Israeli air raid. Palestinian men grieve over the body of Nayef Qarmut, a teenager killed on his way to school in an Israeli military drone strike, as he is prepared for burial at the morgue in Beit Lahiya on March 12, 2012. Nir Elias / Reuters An Iron Dome launcher fires an interceptor rocket near the southern Israeli city of Ashdod March 12, 2012. The military said the air attacks came in response to continued rocket fire, and Israeli police spokesman Micky Rosenfeld reported that 16 rockets were fired into southern Israel early Monday.