Four civilians are thought to have died after riot police clashed with protestors in Rahbiyeh.
It was in a demonstration at demolitions of 71 unsafe houses.
The local governor Zahed Haj Mussa said a number of police and protesters were hurt – 2 are critically ill in hospital.
It happened as police guarded workers who were taking down the properties.
It follows the collapse of a number of houses in the past few years, which have resulted in the deaths of many residents.