The killing of Mohamed Chatah, an adviser to Lebanese ex-premier Saad Hariri in a car bomb attack in Beirut is the latest case of fallout in Lebanon over the 33-month war in neighbouring Syria.

The war in Syria has deeply divided the Lebanese and triggered political tensions and sectarian clashes in the country.

Lebanese Shiite movement Hezbollah is fighting alongside Syrian President Bashar al-Assad's troops, while its Lebanese rivals back Sunni-led rebels. More than 825,000 Syrians have sought refuge in Lebanon since the conflict erupted in March 2011.

Following is a timeline of the fallout in Lebanon from the conflict:

2011

- June 17: Fighting erupts in Lebanon's main northern city of Tripoli between Sunni supporters of the rebels and Alawite supporters of the Damascus regime. Six people are killed.

2012

- August 9: Former information minister Michel Samaha, said to be close to the Damascus regime, is arrested and accused of smuggling explosives into Lebanon for use in attacks.

- August 20-26: Violence flares again in Tripoli, killing 16 people and wounding 118.

- October 19: Lebanese police intelligence chief Wissam al-Hassan, a strong opponent of the Syrian regime, is killed by a car bomb along with seven other people.

2013

- March 18: Lebanese and US officials say Syrian aircraft strike inside Lebanon for the first time, hitting targets near the Sunni town of Arsal. The Damascus regime denies responsibility.

- April 30: Hezbollah leader Hassan Nasrallah says the group's fighters have intervened in Syria on the side of the Assad government.

- May 19-26: New sectarian clashes erupt in Tripoli, killing more than 30 people.

- June 5: The Syrian army backed by Hezbollah retakes the key town of Qusayr, near the Lebanese border.

- June 23-24: Clashes erupt near the southern Lebanese city of Sidon between the army and supporters of radical Sunni Sheikh Ahmad al-Assir, an outspoken backer of the Syrian rebels, killing 18 soldiers.

- July 9: Dozens wounded in car bomb attack in Hezbollah's southern Beirut bastion.

- August 15: A car bomb in Hezbollah's southern Beirut stronghold kills 27.

- August 23: Twin car bombs against Sunni mosques in Tripoli kill 45 people, the deadliest attack in Lebanon since the end of its civil war in 1990.

- November 19: A double suicide attack targets the Iranian embassy in a Hezbollah stronghold in south Beirut, killing 25 people.

- December 2: Lebanese authorities place Tripoli under army control for six months after three days of clashes leave a total of 11 dead.

- December 4: Hezbollah accuses Israel of assassinating a top leader Hassan al-Lakiss near Beirut. Israel denies the allegations.

- December 27: A car bomb in Beirut city centre kills Chatah, and four others while more than 50 are wounded.