Sunday's incident in the Golan Heights area is the fourth such complaint Israel has filed, though so far no one has been injured.

Syrian tanks entered the Golan Heights demilitarized zone last week and fired into Syria; bullets fired at the tanks in response struck an Israeli military vehicle in part of the Golan Heights that Israel claims as its own. Mortars also fell in part of the Golan that Israel considers its territory.

The Golan is regarded internationally as occupied territory despite Israeli governmental control. It is home to 41,000 residents -- including Jews, Druze and Alawites. Israel seized the territory from Syria during the 1967 Israel-Arab war, and it was eventually annexed.

At least 90 killed across Syria

The nearly 20-month conflict in Syria has its roots it the success of popular uprisings in Egypt, Tunisia and Libya, with Syrian demonstrators taking to the streets echoing the calls of Arab Spring protesters for political reform and political freedoms. The violence has taken hold of towns in the north, forcing thousands of Syrians to flee across the border into Turkey.

Al-Assad ordered a brutal crackdown against demonstrators, a move that spawned an armed uprising that has since devolved into a civil war.

At least 90 people were killed in fighting across Syria Sunday, the LCC reported. At least 35 of them were killed in Damascus and its suburbs.

More than 35,000 people are believed to have been killed in the fighting, and more than 400,000 people have been displaced, according to opposition and United Nations estimates.