GAZA CITY, Gaza Strip -- Israel expanded its air assault on rocket-launching operations in the Gaza Strip early today, striking Hamas government and security compounds, smuggling tunnels and electricity sources after an unprecedented Hamas rocket strike on the holy city of Jerusalem raised the stakes in its violent confrontation with the Palestinian militants.
Israeli aircraft also kept pounding their initial targets, the militants' weapons-storage facilities and underground rocket-launching sites. The Israelis called up thousands of reservists and massed troops, tanks and armored vehicles along the border with Gaza, signaling a ground invasion of the densely populated seaside strip could be imminent.
Israel launched its military campaign Wednesday after days of heavy rocket fire from Gaza and has carried out about 700 airstrikes since, the military said. The Islamic militants, undaunted by the heavy damage the airstrikes have inflicted, have unleashed about 500 rockets against the Jewish state, including new, longer-range weapons turned for the first time this week against Jerusalem and Israel's Tel Aviv heartland.
Israel has slowly expanded its operation beyond military targets and, before dawn today, the Gaza Interior Ministry reported, missiles smashed into two small Hamas security facilities, as well as the massive Hamas police headquarters in Gaza City, setting off a huge blaze that engulfed nearby houses and cars parked outside. No one was inside the buildings at the time.The retaliation from Israel was triggered by several days of heavy rocket fire from Gaza. On Wednesday, in a targeted killing, Israel assassinated Ahmed Jabari, the military chief of the ruling Hamas militant group. Israel then conducted dozens of airstrikes on weapons-storage sites used by rocket squads.
Israeli leaders have threatened to widen the operation if the rocket fire doesn't halt. Foreign Minister Avigdor Lieberman said options included the possible assassination of Hamas' prime minister, Ismail Haniyeh, and other top leaders.
"Every time that Hamas fires, there will be a more and more severe response," he told Channel 2 TV. "I really recommend all the Hamas leadership in Gaza not to try us again. . . . Nobody is immune there, not Haniyeh, and not anybody else."
Israeli military officials insist they have inflicted heavy damage on Hamas, but there has been no halt to the militants' rocket fire. Hundreds of rockets have been fired, including a number of sophisticated weapons never before used.
The rocket attack on Jerusalem was unprecedented, setting off the eerie wail of air-raid sirens across the city shortly after the beginning of the Jewish Sabbath, a time when roads are empty. Police said the rocket landed in an open area southeast of the city. Earlier Friday, Hamas fired a rocket at Tel Aviv that also landed in an open area.
Israel's two largest cities have never before been exposed to rocket fire from Hamas-ruled Gaza.
Over the past three days, Israel has struck suspected rocket-launching sites and other Hamas targets in Gaza with scores of airstrikes, while Hamas has fired more than 450 rockets toward Israel. In all, three Israelis and 27 Palestinians have been killed.
On Friday, the Israeli army sent text messages to about 12,000 Gaza residents warning them to steer clear of Hamas operatives.
An attack on Jerusalem, claimed by both Israel and the Palestinians as their capital, was especially bold, both for its symbolism and its distance from the Palestinian territory. Located roughly 50 miles from the Gaza border, Jerusalem had been thought to be beyond the range of Gaza rockets.
"We are sending a short and simple message: There is no security for any Zionist on any single inch of Palestine, and we plan more surprises," said Abu Obeida, a spokesman for Hamas' armed wing.
It marked a bit of a gamble for the militants. The rocket landed near the Palestinian city of Bethlehem and just a few miles from the revered Al-Aqsa Mosque in Jerusalem's Old City, one of Islam's holiest sites.Hamas, an Iran-backed group committed to Israel's destruction, was badly bruised during its last full-fledged confrontation with Israel four years ago that ended with an informal truce, although rocket fire and Israeli airstrikes on militant operations continued sporadically.