Syrian civil war spills into Lebanon after Beirut is hit by rocket attack, injuring four Two neighbourhoods hit by rockets, sparking fears of wider conflict Hezbollah has pledged support to President Assad Lebanese rival factions could be dragged into bloody conflict Fears that the Syrian civil war is spreading into Lebanon grew yesterday after a rocket attack on Beirut. Two southern neighbourhoods of the Lebanese capital which are strongholds of Hezbollah were targeted. At least four people were injured. It came just hours after Hezbollah - a militant Iranian-backed Shia Muslim group - reaffirmed its support for Syrian dictator President Assad. Victim: A wounded man awaits medical attention after two rockets hit his house in Beirut's suburbs Strike: Lebanese army soldiers investigate at a damaged room where a rocket hit an apartment in Chiyah district, south of Beirut The group's leader, Sheikh Hassan Nasrallah, vowed to help Assad win the civil war and warned that his overthrow would give rise to extremists. Assad's opponents are overwhelmingly Sunni Muslims and Lebanon's sectarian divide mirrors that of Syria, with Lebanese factions taking sides in their neighbour's civil war. One rebel leader has threatened to strike Hezbollah strongholds in retaliation for the group sending men to fight alongside Assad's forces. The rocket attack came two days after Russia's foreign ministry said the Syrian government has agreed to a conference on the country's future proposed by Russia and the United States. A Lebanese man shows the remains of one of the rockets. Hezbollah supports President Assad, but Sunni opponents in Lebanon favour the Syrian opposition Tensions have been running high in Lebanon, and Syrian rebels have threatened to retaliate against Hezbollah for sending fighters to assist President Bashar Assad's forces in Syria Blast zone: Lebanese security officials said at least four people were injured Sectarian: A flag with an icon of Imam Ali, an important figure for Shia Muslims, is seen in front of a balcony where a rocket struck A Lebanese army officer investigates part of a rocket which struck a car on the street in the Mar Mikhael district, south of Beirut