Israeli officials are concerned about reports that Hizbullah is putting its hands on Syrian arms, though it is still unclear whether the Lebanese party has gotten hold of chemical weapons, Israeli daily Haaretz reported on Tuesday.

The newspaper quoted Israeli officials as saying that it remains unclear how far Washington will go to help bring about the downfall of Syrian President Bashar Assad.

Shots fired from Syria at a Syrian refugee camp inside Turkey are a "clear violation" of the common border between the two countries, Turkish Prime Minister Recep Tayyip Erdogan said Tuesday.

"It was a very clear violation of the border," Erdogan told reporters in Beijing, where he is on an official visit. "Obviously we will take the necessary measures," he was quoted as saying by the Turkish news agency Anatolia.

The Lebanese army has exposed soldiers who breached its security by stealing arms from its warehouses and selling them to weapons dealers who in their turn smuggled the equipment to the rebel Free Syrian Army, al-Akhbar newspaper reported on Monday.

The army intelligence branch arrested Officer Kh. H. from the town of Arsal in the eastern Bekaa valley, who worked as a guard at a warehouse belonging to the army’s eighth battalion.

U.N. leader Ban Ki-moon on Monday “strongly” deplored the fatal cross-border shootings from Syria into Lebanon and Turkey earlier in the day, U.N. spokesman Martin Nesirky said in a statement.

Ban also made a final plea for President Bashar al-Assad to halt attacks on civilians ahead of a Tuesday deadline to withdraw troops and heavy guns from Syria's cities.

Syrian leader Bashar al-Assad has shown no sign so far that his government is sticking by a peace plan to end the fighting in Syria just hours before a U.N. deadline, the White House said Monday.

"We certainly have seen no sign yet of the Assad regime abiding by its commitments," White House spokesman Jay Carney told reporters.

A peace plan for Syria was in jeopardy on Monday as deadly fresh clashes raged after President Bashar al-Assad's government laid down conditions for it to pull troops and armor out of protest hubs.

Security forces killed 151 people across the country, among them more than 30 women and children and four rebels, the Local Coordination Committees, the main activist group spurring protests on the ground, said.

Phalange Party leader Amine Gemayel expressed fear on Monday that the Syrian turmoil might spill into Lebanon over the sharp differences between parties on their stances from the regime.

“Lebanon should disassociate itself from the developments in Syria,” he told reporters.

Two Syrians among a group of 17 who were wounded when their village was shelled overnight died after crossing the border into nearby Turkey, an official said Monday.

Two other Syrians and a Turkish translator were wounded near a refugee camp in the same area when shots were fired from Syria, as border tension escalated ahead of a visit by top international mediator Kofi Annan.

The Syrian rebel army said Monday it is ready to respect a truce brokered by U.N.-Arab League envoy Kofi Annan if the regime of President Bashar Assad abides by the peace deal.

"We have announced that we will cease operations against the army of the regime on the morning of April 10, and we will respect this pledge if the regime commits to respecting the terms of the (U.N.) plan," Free Syrian Army spokesman Colonel Kassem Saadeddine said in a statement received by AFP.

China on Monday urged Syria to honor its ceasefire commitment, after Damascus said it wanted guarantees from armed rebels before it pulled back its troops from protest hubs.

The Syrian army was scheduled to withdraw from protest cities on Tuesday under a peace deal brokered by former U.N. chief Kofi Annan, with a complete end to fighting set for 48 hours later.