A boy looks at a Palestinian boy wounded in an Israeli air strike, at Nassir hospital in Khan Younis in the southern Gaza Strip January 29, 2009. Palestinian rocket attacks and Israeli air strikes threatened on Thursday to undermine efforts by U.S. President Barack Obama’s Middle East envoy to reinforce a fragile Gaza ceasefire. REUTERS/Ibraheem Abu Mustafa (GAZA)

Doctors treat a wounded Palestinian boy following an Israeli air strike in Khan Yunis in the southern Gaza Strip on January 29, 2009. Eighteen Palestinians, including 11 schoolchildren and a pregnant woman, were wounded in an Israeli air strike in the southern Gaza Strip, witnesses and medics said. AFP PHOTO/ SAID KHATIB (Photo credit should read SAID KHATIB/AFP/Getty Images)

Palestinian doctors treat a wounded girl after an Israeli air strike in Khan Yunis in the southern Gaza Strip January 29, 2009. Eighteen Palestinians, including 11 schoolchildren and a pregnant woman, were wounded in an Israeli air strike in the southern Gaza Strip, witnesses and medics said. AFP PHOTO/ SAID KHATIB (Photo credit should read SAID KHATIB/AFP/Getty Images)

A Palestinian boy who was injured in an Israeli missile strike is wheeled into hospital in Khan Younis, southern Gaza Strip, Thursday, Jan. 29, 2009. Palestinians fired a rocket into Israel early Thursday, and residents of the south Gaza town of Khan Younis said an Israeli airstrike there wounded a man riding a motorcyle and five passers-by, among them children walking home from school. The Israeli military said it targeted the motorcyclist because he was involved in a bomb attack Tuesday on the Gaza-Israel border which killed an Israeli soldier and wounded three others. (AP Photo/Eyad Baba)

A wounded Palestinian girl lies in Nasser hospital after an Israeli air strike in Khan Younis in the southern Gaza Strip January 29, 2009. Palestinian rocket attacks and Israeli air strikes threatened on Thursday to undermine efforts by U.S. President Barack Obama’s Middle East envoy to reinforce a fragile Gaza ceasefire. REUTERS/Ibraheem Abu Mustafa (GAZA)

A Palestinian boy who was injured in an Israeli missile strike reacts in hospital in Khan Younis, southern Gaza Strip, Thursday, Jan. 29, 2009. Palestinians fired a rocket into Israel early Thursday, and residents of the south Gaza town of Khan Younis said an Israeli airstrike there wounded a man riding a motorcyle and five passers-by, among them children walking home from school. The Israeli military said it targeted the motorcyclist because he was involved in a bomb attack Tuesday on the Gaza-Israel border which killed an Israeli soldier and wounded three others. (AP Photo/Eyad Baba)

A Palestinian girl who was injured in an Israeli missile strike reacts in hospital in Khan Younis, southern Gaza Strip, Thursday, Jan. 29, 2009. Palestinians fired a rocket into Israel early Thursday, and residents of the south Gaza town of Khan Younis said an Israeli airstrike there wounded a man riding a motorcyle and five passers-by, among them children walking home from school. The Israeli military said it targeted the motorcyclist because he was involved in a bomb attack Tuesday on the Gaza-Israel border which killed an Israeli soldier and wounded three others. (AP Photo/Eyad Baba)

A Palestinian surveys a metal workshop destroyed after an Israeli air strike in Rafah in the southern Gaza Strip January 29, 2009. Palestinian rocket attacks and Israeli air strikes threatened on Thursday to undermine efforts by U.S. President Barack Obama’s Middle East envoy to reinforce a fragile Gaza ceasefire. Israeli aircraft struck in the southern Gaza Strip, attacking a metal workshop that the military called a weapons factory, causing no casualties, and a motorcycle, wounding two militants and 10 youths passing by, medical workers said. REUTERS/Ibraheem Abu Mustafa (GAZA)