Israeli Defence Minister Ehud Barak blamed Hamas on Friday for the detonation of an explosives tunnel along the Gaza border which wounded a soldier, and said he was mulling how and when to respond.

The blast, which was claimed by the armed wing of the ruling Islamist Hamas movement, took place several hours after a Palestinian teenager was shot dead by troops in the same area, just east of the southern city of Khan Yunis, Palestinian medical officials and witnesses said.

Israel's deputy prime minister Moshe Yaalon warned Damascus on Friday it would act to defend its sovereignty if the bloody fighting in Syria continued to spill over into the occupied Golan Heights.

His remarks, published on his official Twitter account, were made a day after three stray mortar rounds fired from Syria hit the occupied Golan, which Israel seized in the 1967 Middle East war and annexed in 1981 in a move never recognized by the international community.

A Palestinian teenager died Thursday after being hit by bullets fired from an Israeli helicopter in the Gaza Strip, and a booby-trapped tunnel in the same area lightly wounded an Israeli soldier, officials said.

Ashraf al-Qudra, spokesman for Gaza's Hamas-run health ministry, named the victim killed near Khan Yunis in the southern Gaza Strip as 13-year-old Hmeid Abu Daqqa, and said he had been killed near the border.

Three mortar shells fired from Syria landed in the Israeli-occupied Golan Heights on Thursday, causing no damage or injuries, the army said, in the latest apparent spillover from violence ravaging Syria.

"They are apparently shells fired in error during fighting between different forces inside Syria," an Israeli army spokeswoman told Agence France Presse.

Israel Prime Minister Benjamin Netanyahu on Wednesday congratulated U.S. President Barack Obama on his re-election, saying ties between their two countries were "stronger than ever."

"The prime minister congratulates the president of the United States for his victory in the election," Netanyahu said in a statement. "The strategic alliance between Israel and the United States is stronger than ever."

Israel is preparing to counter a Palestinian bid for enhanced United Nations status later this month, a foreign ministry spokesman told AFP on Tuesday.

The comments came as Israel's private Channel 10 reported that Foreign Minister Avigdor Lieberman last month pledged to ensure the "collapse" of the Palestinian Authority if the bid for non-member status at the General Assembly goes forward.

The Israeli foreign ministry on Tuesday slammed Turkey for carrying out what it called a "show trial" of four top former Israeli commanders over a deadly 2010 Israeli raid on a Gaza-bound flotilla.

"This is not a trial but a show trial and has nothing to do with law and justice," foreign ministry spokesman Yigal Palmor told Agence France Presse.

Israel on Tuesday published tenders for 1,213 new homes in settlement neighborhoods of east Jerusalem, and re-offered tenders for another 72 homes in a West Bank settlement, an Israeli NGO said.

Peace Now, citing tenders published by the Israeli housing ministry, said tenders for 607 units in Pisgat Zeev and 606 units in Ramot, both in east Jerusalem, were offered, along with 72 re-offered in the settlement of Ariel.

Three Israeli soldiers were injured on Tuesday morning by an explosion along the border between Israel and the Gaza Strip, the Israeli military said.

"An IDF soldier was moderately wounded and two others lightly wounded while on a routine activity earlier this morning, adjacent to the security fence in the southern Gaza Strip," the military said in a statement.

Israeli Prime Minister Benjamin Netanyahu on Monday said his country is ready to strike Iran's nuclear sites "if necessary."

An Israeli TV network said Sunday that Netanyahu and Defense Minister Ehud Barak in 2010 ordered the army to prepare an attack against Iranian nuclear installations, though the order was later rescinded.