The Iranian-made Fajr 5 rocket fired at Tel Aviv by Palestinian militants has a far greater range than the home-made Qassam rockets used by Hamas in Gaza, but neither are very accurate, experts say.

Fajr 5 rockets can be fired from the back of a 6x6 truck and can hit targets up to 75 kilometers (46 miles) away, according to London-based defense analysts IHS Jane's.

U.S. President Barack Obama and Turkish Prime Minister Recep Tayyip Erdogan expressed concern Friday that renewed violence in Israel and the Gaza Strip would damage the Middle East peace process.

"The two leaders shared their concerns about the dangers to civilian populations on both sides and expressed their common desire to see an end to the violence," the White House said, after Obama called the Turkish leader.

Pakistan on Friday condemned Israeli air strikes on the Gaza Strip and vowed to stand by the people of Palestine against "Israeli aggression".

"Pakistan strongly condemns Israeli air attacks in Gaza that have targeted not only the Hamas leadership but also innocent civilians," Pakistan's foreign ministry said in a statement.

Israel's bombing campaign in Gaza will not derail a Palestinian bid to seek upgraded membership at the United Nations later this month, president Mahmud Abbas said on Friday.

"What is happening in Gaza is aimed at preventing our request to get the status of non-member state the United Nations, but we will vote on the resolution on November 29," he said in a televised address.

Turkish Prime Minister Recep Tayyip Erdogan on Friday accused Israeli officials of having ordered the air strikes on the Gaza Strip that left 23 Palestinians dead as an electoral move ahead of January's general election.

"Once again this time, they're on the eve of an election," Erdogan told reporters, recalling Israel's "Cast Lead" Gaza offensive which began just six weeks before the 2009 election.

Hamas militants from the Ezzedine al-Qassam Brigades on Friday executed a man on charges of "collaborating" with Israel as warplanes pounded Gaza, Palestinian sources said.

"The Qassam Brigades on Friday executed a collaborator for providing guidance and information on the locations of the resistance and their rocket launchers to the Israeli occupation," a source told Agence France Presse on condition of anonymity.

Israeli Defense Minister Ehud Barak on Thursday approved the call-up of 30,000 reserve soldiers, who can be called into action by the military at any point, the army's official spokesman said.

"We are in the process of expanding the campaign," Brigadier General Yoav Mordechai told Channel 2 television as Israel pressed a massive air campaign against Gaza militants.

The United States on Thursday blamed Hamas for an explosion of violence in Gaza after salvoes of rockets were fired into Israel in retaliation for the killing of the group's military chief.

Expressing regret for the victims on both sides of the conflict, White House spokesman Jay Carney said there was "no justification" for the violence on the part of Hamas, saying it "does nothing to help the Palestinians."

Israel will take "whatever action is necessary" to defend its citizens from Palestinian rocket attacks, Prime Minister Benjamin Netanyahu said on Thursday as Gaza's Hamas rulers noted that the current conflict “will shorten the era of occupation.”

Netanyahu's remarks at a televised press conference in Tel Aviv came after Israel carried out 24 hours of air strikes on Gaza, killing 15 Palestinians, at least seven of them Hamas militants.

Hundreds of Tunisians demonstrated on Thursday against Israel's deadly attacks on Gaza, as Israeli planes pounded armed groups in the Palestinian territory for a second day, an AFP journalist reported.

Several hundred protesters, gathered on Habib Bourguiba Avenue in the center of Tunis, shouted slogans such as "No to reconciliation," and "The people want to criminalize normalized relations with the (Zionist) entity."