In a picture taken on August 30, 2008, Hamas police chief, General Tawfiq Jabr, visits the Rafah border crossing in the southern Gaza Strip. Jabr was one of three Hamas senior officials killed on December 27, 2008, by Israeli air strikes that hammered the Gaza Strip. killed in Israeli air strikes on Gaza on December 27, 2008. Israel war planes struck over 50 targets in the Gaza Strip on December 27. Photo By Abed Rahim Khatib / FLASH90

Smoke rise after a burning building following a fresh Israeli air strike in Rafah town in the southern Gaza Strip early on December 28, 2008. Israel warned today that it could send ground troops into Gaza as its warplanes continued to pound Hamas targets in the overcrowded enclave.Photo By Abed Rahim Khatib / FLASH90

Smoke rise after a burning building following a fresh Israeli air strike in Rafah town in the southern Gaza Strip early on December 28, 2008. Israel warned today that it could send ground troops into Gaza as its warplanes continued to pound Hamas targets in the overcrowded enclave.Photo By Abed Rahim Khatib / FLASH90

Smoke rise after a burning building following a fresh Israeli air strike in Rafah town in the southern Gaza Strip early on December 28, 2008. Israel warned today that it could send ground troops into Gaza as its warplanes continued to pound Hamas targets in the overcrowded enclave.Photo By Abed Rahim Khatib / FLASH90

Smoke rise after a burning building following a fresh Israeli air strike in Rafah town in the southern Gaza Strip early on December 28, 2008. Israel warned today that it could send ground troops into Gaza as its warplanes continued to pound Hamas targets in the overcrowded enclave.Photo By Abed Rahim Khatib / FLASH90

Smoke rise after a burning building following a fresh Israeli air strike in Rafah town in the southern Gaza Strip early on December 28, 2008. Israel warned today that it could send ground troops into Gaza as its warplanes continued to pound Hamas targets in the overcrowded enclave.Photo By Abed Rahim Khatib / FLASH90

Smoke rise after a burning building following a fresh Israeli air strike in Rafah town in the southern Gaza Strip early on December 28, 2008. Israel warned today that it could send ground troops into Gaza as its warplanes continued to pound Hamas targets in the overcrowded enclave.Photo By Abed Rahim Khatib / FLASH90

Smoke rise after a burning building following a fresh Israeli air strike in Rafah town in the southern Gaza Strip early on December 28, 2008. Israel warned today that it could send ground troops into Gaza as its warplanes continued to pound Hamas targets in the overcrowded enclave.Photo By Abed Rahim Khatib / FLASH90

Smoke rise after a burning building following a fresh Israeli air strike in Rafah town in the southern Gaza Strip early on December 28, 2008. Israel warned today that it could send ground troops into Gaza as its warplanes continued to pound Hamas targets in the overcrowded enclave.Photo By Abed Rahim Khatib / FLASH90

Smoke rise after a burning building following a fresh Israeli air strike in Rafah town in the southern Gaza Strip early on December 28, 2008. Israel warned today that it could send ground troops into Gaza as its warplanes continued to pound Hamas targets in the overcrowded enclave.Photo By Abed Rahim Khatib / FLASH90

Smoke rise after a burning building following a fresh Israeli air strike in Rafah town in the southern Gaza Strip early on December 28, 2008. Israel warned today that it could send ground troops into Gaza as its warplanes continued to pound Hamas targets in the overcrowded enclave.Photo By Abed Rahim Khatib / FLASH90

Smoke rise after a burning building following a fresh Israeli air strike in Rafah town in the southern Gaza Strip early on December 28, 2008. Israel warned today that it could send ground troops into Gaza as its warplanes continued to pound Hamas targets in the overcrowded enclave.Photo By Abed Rahim Khatib / FLASH90

Palestinian civil defence workers use hoses and a bulldozer to attempt to control a fire consuming a building following a fresh Israeli air strike in Rafah town in the southern Gaza Strip early on December 28, 2008. Israel warned today that it could send ground troops into Gaza as its warplanes continued to pound Hamas targets. Photo By Abed Rahim Khatib / FLASH90

Palestinian civil defence workers use hoses and a bulldozer to attempt to control a fire consuming a building following a fresh Israeli air strike in Rafah town in the southern Gaza Strip early on December 28, 2008. Israel warned today that it could send ground troops into Gaza as its warplanes continued to pound Hamas targets. Photo By Abed Rahim Khatib / FLASH90

Palestinian civil defence workers use hoses and a bulldozer to attempt to control a fire consuming a building following a fresh Israeli air strike in Rafah town in the southern Gaza Strip early on December 28, 2008. Israel warned today that it could send ground troops into Gaza as its warplanes continued to pound Hamas targets. Photo By Abed Rahim Khatib / FLASH90

Palestinian relative mourn over the body of Hamas police chief, General Tawfiq Jabr, during his funeral in Rafah town in the southern Gaza Strip. on December 28, 2008. Some 280 Palestinians have been killed and 600 people wounded since Israel's campaign to quash rocket barrages from Gaza began midday Saturday, a Gaza health official said. Most of the dead were Hamas police. photo By Abed Rahim Khatib / FLASH90

Palestinians attend the funeral of 15 people killed during Israeli air strikes at a football stadium in Rafah, southern Gaza Strip on December 28, 2008.Some 280 Palestinians have been killed and 600 people wounded since Israel's campaign to quash rocket barrages from Gaza began midday Saturday, a Gaza health official said. Most of the dead were Hamas police. photo By Abed Rahim Khatib / FLASH90

Palestinians attend the funeral of 15 people killed during Israeli air strikes at a football stadium in Rafah, southern Gaza Strip on December 28, 2008.Some 280 Palestinians have been killed and 600 people wounded since Israel's campaign to quash rocket barrages from Gaza began midday Saturday, a Gaza health official said. Most of the dead were Hamas police. photo By Abed Rahim Khatib / FLASH90

Smoke billows from a tunnel in Rafah on Gaza's border with Egypt following an Israeli air strike on the area on December 28, 2008. Israeli tanks massed at the Gaza border today as warplanes continued to pound Hamas targets in the densely populated enclave where raids have killed nearly 290 people in less than two days. Jets also bombed a series of tunnels on the Gaza-Egypt border -- a lifeline for Hamas used for smuggling in goods and weapons into the enclave, which has been virtually sealed by Israel since the Islamists violently seized power in June 2007.photo By Abed Rahim Khatib / FLASH90

A wounded Palestinian youth is wheeled into a hospital in Rafah following Israeli air strikes on tunnels on the border between Gaza and Egypt on December 28, 2008. Israeli tanks massed at the Gaza border today as warplanes continued to pound Hamas targets in the densely populated enclave where raids have killed nearly 290 people in less than two days. Jets also bombed a series of tunnels on the Gaza-Egypt border -- a lifeline for Hamas used for smuggling in goods and weapons into the enclave, which has been virtually sealed by Israel since the Islamists violently seized power in June 2007.photo By Abed Rahim Khatib / FLASH90

Smoke billows from a tunnel in Rafah on Gaza's border with Egypt following an Israeli air strike on the area on December 28, 2008. Israeli tanks massed at the Gaza border today as warplanes continued to pound Hamas targets in the densely populated enclave where raids have killed nearly 290 people in less than two days. Jets also bombed a series of tunnels on the Gaza-Egypt border -- a lifeline for Hamas used for smuggling in goods and weapons into the enclave, which has been virtually sealed by Israel since the Islamists violently seized power in June 2007.photo By Abed Rahim Khatib / FLASH90