Israel on Monday confirmed finding the bodies of three teenagers who disappeared in the southern West Bank on June 12, blaming the Palestinian Hamas movement for their kidnapping and murder.

"During the search for Eyal Ifrach, Gilad Shaer and Naftali Frankel, the IDF discovered 3 bodies near Hebron," the Israeli army said in a statement on Twitter.

Israel issued a brusque warning to Hamas on Monday, demanding it prevent rocket fire from Gaza as fears grew of a new confrontation around the coastal Palestinian enclave.

The military said an estimated 14 rockets slammed into Israel early in the morning, although the last struck at around 8.20 am (0520 GMT). Nobody was hurt.

Israeli Prime Minister Benjamin Netanyahu asked the international community on Sunday to support Jordan in the fight against "Islamic extremism" and to back the independence of Iraq's Kurds.

"We need to support efforts by the international community to strengthen Jordan and support the aspirations of the Kurds for independence," Netanyahu said in a speech to the Institute of National Security Studies think-tank in Tel Aviv.

Israel is "ready" to expand its operations in Gaza, Prime Minister Benjamin Netanyahu warned Sunday after the air force struck 12 targets overnight following a surge in militant rocket fire.

Speaking to ministers at the weekly cabinet meeting, the Israeli premier said the almost-nightly military strikes on Gaza could be expanded should the need arise.

Israeli Prime Minister Benjamin Netanyahu praised Palestinian President Mahmud Abbas Tuesday for condemning the alleged kidnapping of three teenagers by Hamas, but slammed his unity pact with the Islamist movement.

"I appreciate what president Abbas said a few days ago in Saudi Arabia, rejecting the kidnapping," Netanyahu told his Romanian counterpart Victor Ponta at a meeting in Jerusalem.

Israel carried out retaliatory air raids on Syrian army positions in the Golan Heights overnight after a teenager on the Israeli side was killed in an attack from Syria, the army said early Monday.

"The IDF (Israeli army) targeted nine Syrian army positions in response to the earlier attack that originated in Syria killing an Israeli teenager and injuring two other Israeli civilians," an army spokesman said.

Israeli Prime Minister Benjamin Netanyahu on Sunday warned close ally the United States against working with arch-foe Iran in the effort to pull Iraq back from the brink.

Israel has consistently voiced fears that a swift jihadist offensive led by the Islamic State of Iraq and the Levant (ISIL) that has swept up swaths of Iraq may prompt concessions to Tehran from Washington.

Israel stepped up efforts to crush Hamas in the West Bank Tuesday as the hunt for three Israeli teenagers believed kidnapped by the Islamist movement entered its fifth day.

Thousands of troops searching for the youths turned their attention overnight to the northern West Bank city of Nablus and surrounding area, arresting 41 Palestinians, the army said.

Israel will seek to deal a crushing blow to Hamas's West Bank infrastructure following the kidnapping of three Israeli teenagers, army radio reported on Monday.

Plans to move against the Islamist movement were discussed at a meeting of the security cabinet convened by Prime Minister Benjamin Netanyahu at which ministers discussed punitive steps against Hamas which Israel has blamed for the kidnapping of three teenagers, media reports said.

Israeli premier Benjamin Netanyahu told Palestinian President Mahmud Abbas Monday he expected his help in ensuring the return of three kidnapped teenagers, in their first direct political contact since 2012.

The phone conversation took place as Israel pressed a vast search operation in the West Bank to find the three youths, whom Netanyahu has said were kidnapped last week by militants from the Islamist Hamas movement.