The fighting in Syria has spread to Tripoli in neighbouring Lebanon.
Tension has been rising between Tripoli's Sunnis, who support the Syrian opposition against the government of President Bashar al-Assad, and supporters of the Syrian government including Tripoli's Alawite community.
The arrest of Shadi Almawlawi, a young Sunni sheikh, triggered the armed clashes.
His supporters burnt tires, blocked the city's main roads and deployed armed men on the streets.
Fighting that started on Sunday continued into Monday, with pressure mounting on the Lebanese army to stop the violence.
Al Jazeera's Rula Amin reports from Tripoli.