Israel's Foreign Minister Avigdor Lieberman said on Sunday that Israel would not negotiate a truce with Gaza Strip's Hamas rulers as long as rocket fire continues from the Palestinian enclave.

"The first and absolute condition for a truce is stopping all fire from Gaza," he said before meeting French Foreign Minister Laurent Fabius, adding that all militant factions in Gaza would have to commit to cease rocket fire.

The Gaza-based offices of a Kremlin-funded international Russian TV broadcaster were severely damaged Sunday in an Israeli raid on two buildings housing Palestinian and other media outlets, the station said.

The Israeli army confirmed attacking the Shurouq center in Gaza City in an attempt to interrupt what it said was Hamas "operational communications" from the building.

Iran expects regional countries to send weapons to the Palestinians to help them fight Israel, parliamentary speaker Ali Larijani said on Sunday.

"Although political measures taken by the regional countries are admirable, they are definitely not sufficient," Larijani said in remarks reported by the official IRNA news agency.

Talks on the possibility of a truce to end five days of violence in and around Gaza are under way, and a deal could be reached "today or tomorrow," a Palestinian official told Agence France Presse on Sunday.

"There are serious talks to reach a truce, and it is possible that understandings will be reached today or tomorrow," the senior official said.

Arab League chief Nabil al-Arabi said on Saturday that the bloc should review its peace proposals to Israel and its entire stance on the peace process in response to the conflict in Gaza.

Member states should "reconsider all past Arab initiatives on the peace process and review their stance on the process as a whole," he told an Arab foreign ministers' meeting in Cairo called to discuss the conflict.

Rocket attacks fired on Israel by Palestinian militants in Gaza were a "precipitating factor" in the conflict that has engulfed the two sworn enemies, a top U.S. official said Saturday.

Deputy National Security Adviser Ben Rhodes said both President Barack Obama and Israeli Prime Minister Benjamin Netanyahu agree that de-escalation is preferable, provided that Hamas ceases firing on Israel.

Hamas chief Khaled Meshaal was in Cairo on Saturday to confer on ending the Gaza conflict but the Islamist group is reluctant to agree a ceasefire without guarantees Israel will honor it, a senior Hamas official said.

Meshaal was scheduled to meet with Egypt's intelligence chief as well as Turkish Prime Minister Tayyip Erdogan and Qatari Emir Hamad bin Khalifa al-Thani, both visiting Cairo, said the official, who spoke on condition of anonymity.

Turkish Prime Minister Recep Tayyip Erdogan said on Saturday that Israel would be held to account for the children among 40 people dead in three days of air strikes on Gaza.

"Everyone must know that sooner or later there will be a holding to account for the massacre of these innocent children killed inhumanely in Gaza," he said in a speech at Cairo University.

A senior Iranian official has denied his country supplied the Fajr 5 missiles which Palestinian militants have been firing at Tel Aviv, Iran's al-Alam television reported on Saturday.

"We deny having delivered the Fajr 5 to the Palestinian resistance. The aim of such accusations is to portray the resistance as weak whereas it is perfectly capable of producing the arms it needs," said Allaeddine Boroujerdi, head of parliament's foreign affairs committee.

Afghan President Hamid Karzai on Saturday condemned Israel's airstrikes on Gaza and called for an "immediate stop" to violence against civilians, a statement from his office said.

"President Hamid Karzai strongly condemns the strikes by Israel against the Palestinian territory that have killed and injured a number of innocent civilians," the statement said.