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An image grab taken from a video uploaded on YouTube on March 26, 2012, shows smoke billowing from reported shelling by Syrian government forces on a residential area in the flashpoint central city of Homs, as China called on all parties in Syria to cooperate with the mediation efforts of Kofi Annan, as the United Nations and Arab League envoy held talks with Chinese leaders. Image Credit: AFP

Beirut: Lebanese security officials say clashes in Syria have spilled across the border into Lebanon.

Two Lebanese officials, one from the police and another from the military, say the clashes on the Syrian side of the border started on Tuesday afternoon in the Mashareaa al-Qaa area. Both officials said bullets struck the Lebanese side of the border.

But the officials said no troops have crossed over into Lebanon. The UN says more than 8,000 people have been killed in Syria's yearlong uprising.

There are concerns that the conflict could cause a regional conflagration.

Four people killed in Idlib

Earlier Tuesday it was reported that an activist group says Syrian security forces have killed 10 people as the regime pushes to retake areas still under rebel control.

The Britain-based Syrian Observatory for Human Rights says four people died in Tuesday's attacks in the northwestern Idlib province.

The government recently recaptured the provincial capital, also called Idlib, after it was under rebel control for months.

The Observatory also says six people were killed Tuesday in the Damascus suburbs of Zabadani and Douma, the central city of Homs and in the eastern region of Deir Al Zour.

Syria's uprising has become increasingly militarised, with many in the opposition taking up arms in self-defense or to fight the government.

The UN says more than 8,000 people have been killed in the yearlong conflict.