At least four people were killed and 10 more injured in an explosion in the Syrian capital Damascus on Thursday, state media reported.Authorities are investigating the cause of the blast that took place inside a cafe near the Justice Palace.The victims were evacuated to hospitals, the head of the Health Ministry's Ambulance and Emergency Department told state news agency Sana.Internal security forces have imposed a security cordon around the site of the explosion, the state TV reported.This is a developing story ...