JABALIA, GAZA STRIP - JUNE 27: Palestinian militants guard a street for a possible Israeli army ground operation on June 27, 2006 in the Jabalia refugee camp in the northern Gaza Strip. As Israel massed troops along the Gaza border, a Palestinian militant leader on Tuesday said a captured Israeli soldier was being held in a 'secure place' and claimed his group also seized a Jewish settler in the West Bank. (photo by Ahmad Khateib/ flash 90)

JABALIA, GAZA STRIP - JUNE 27: Palestinian youths fill bags with sand and build a mound in preparation for a possible Israeli army ground operation on June 27, 2006 in the Jabalia refugee camp in the northern Gaza Strip. As Israel massed troops along the Gaza border, a Palestinian militant leader on Tuesday said a captured Israeli soldier was being held in a 'secure place' and claimed his group also seized a Jewish settler in the West Bank. (photo by Ahmad Khateib/ flash 90)

JABALIA, GAZA STRIP - JUNE 27: Palestinian militants guard a street for a possible Israeli army ground operation on June 27, 2006 in the Jabalia refugee camp in the northern Gaza Strip. As Israel massed troops along the Gaza border, a Palestinian militant leader on Tuesday said a captured Israeli soldier was being held in a 'secure place' and claimed his group also seized a Jewish settler in the West Bank. (photo by Ahmad Khateib/ flash 90)

JABALIA, GAZA STRIP - JUNE 27: Palestinian militants guard a street for a possible Israeli army ground operation on June 27, 2006 in the Jabalia refugee camp in the northern Gaza Strip. As Israel massed troops along the Gaza border, a Palestinian militant leader on Tuesday said a captured Israeli soldier was being held in a 'secure place' and claimed his group also seized a Jewish settler in the West Bank. (photo by Ahmad Khateib/ flash 90)

JABALIA, GAZA STRIP - JUNE 27: A Palestinian boy looks at a militant while he guards a street for a possible Israeli army ground operation on June 27, 2006 in the Jabalia refugee camp in the northern Gaza Strip. As Israel massed troops along the Gaza border, a Palestinian militant leader on Tuesday said a captured Israeli soldier was being held in a 'secure place' and claimed his group also seized a Jewish settler in the West Bank. (photo by Ahmad Khateib/ flash 90)

JABALIA, GAZA STRIP - JUNE 27: Palestinian militants guard a street for a possible Israeli army ground operation on June 27, 2006 in the Jabalia refugee camp in the northern Gaza Strip. As Israel massed troops along the Gaza border, a Palestinian militant leader on Tuesday said a captured Israeli soldier was being held in a 'secure place' and claimed his group also seized a Jewish settler in the West Bank. (photo by Ahmad Khateib/ flash 90)

GAZA CITY, GAZA STRIP - JUNE 27, 2006: Palestinians examine a car that exploded in Gaza City June 27, 2006. The blast killed a 21-year-old member of Hamas' military wing and wounded two bystanders, officials said. The Israeli army, which routinely claims responsibility for airstrikes in Gaza, said it was not involved in the blast. Israel has been threatening tough military action in Gaza since a soldier was abducted by Hamas-linked militants on Sunday Photo by Ahmad Khateib /Flash 90

GAZA CITY, GAZA STRIP - JUNE 27, 2006: Palestinians remove damaged after that a car exploded in Gaza City June 27 2006. The blast killed a 21-year-old member of Hamas' military wing and wounded two bystanders, officials said. The Israeli army, which routinely claims responsibility for airstrikes in Gaza, said it was not involved in the blast. Israel has been threatening tough military action in Gaza since a soldier was abducted by Hamas-linked militants on Sunday Photo by Ahmad Khateib /Flash 90