Syria has condemned Israel after air strikes against Damascus, saying the attacks aim "to give direct military support to terrorist groups".
President Barack Obama said he does not foresee a scenario in which he would send US ground troops to Syria.
Israel claim that Syrian government forces have used a chemical weapons likely to be the nerve gas Sarin in their fight against rebels.
The Syrian military says it has destroyed an Israeli vehicle which it says crossed the Golan Heights ceasefire line into Syrian territory.
In March, 21 UN peacekeepers were taken hostage by rebel fighters in the same region before being released unharmed.
Israel's prime minister Benjamin Netanyahu will use alternative sleeping arrangements during future flights, after spending tens of thousands of pounds of public funds on installing a customised bed for his recent trip to London.
Mr Netanyahu splashed out £82,000 on a customised sleeping cabin for a five-hour flight to attend the funeral of Margaret Thatcher last month, according to the Israeli TV's Channel 10.
The prime minister's office initially defended the decision, citing his busy schedule and his need to be fresh and alert for important meetings.
Officials said he had been unaware of the cost and has since ordered the bed to be cancelled on all future flights.
The controversy comes as the Israeli government seeks to implement austerity measures and tax increases.
Earlier in the year, Mr Netanyahu stopped buying ice cream from a Jerusalem parlour which was costing his office £1,760 a year, following revelations by an Israeli newspaper.
US Secretary of State John Kerry will meet Israeli Justice Minister Tzipi Livni, in Rome on Wednesday, the U.S. State Department has said.
Mr Livni has a special responsibility for the Israeli-Palestinian peace process. Mr Kerry will also meet Jordanian Foreign Minister Nasser Judeh in Rome.
The meetings are part of Kerry's effort to find a way to revive Israeli-Palestinian peace negotiations, which fell apart in 2010 in a dispute over Israel's construction of Jewish settlements on West Bank land the Palestinians want for a state.
An Israeli airstrike on a military complex near Damascus killed at least 42 Syrian soldiers, the Syrian Observatory for Human Rights said.
Israel confirmed that its warplanes had carried out an air strike in Syria, targeting a shipment of missiles reported to be destined for Lebanon.
Hundreds of Sunni Muslim families also fled the Syrian coast after massacres, reportedly carried out by government forces.
Tom Barton reports:
Israeli officials have confirmed that an air strike in Syria has been carried out targeting a shipment of "advanced missiles" believed to be bound to Hezbollah militants in Lebanon.
Meanwhile, President Obama said the US will not "leap before we look" over alleged use of chemical weapons.
Tom Savvides reports.
Israeli officials have confirmed an air strike on Syria, and said it targeted a shipment of advanced missiles, the Associated Press reports.
– A spokesman for the Israeli Embassy in Washington
We cannot comment on these reports, but what we can say is that Israel is determined to prevent the transfer of chemical weapons or other game-changing weaponry by the Syrian regime to terrorists, especially to Hezbollah in Lebanon.