Update at 12.45am: Contributor to citizen journalism site Stomp Sonia said: "A bus driver knocked down a man and he was dead under the bus, so the people saw that and ganged up to throw glass bottles at the bus window and make a big mess."
Another contributor Scott, who was at the scene, said that the crowd was trying to smash the windows of a private bus, when the Police and SCDF arrived to evacuate the driver.
However, a larger crowd appeared after this and overturned the Police cars and motorbikes before setting them on fire.
Police confirm an incident is ongoing at the junction of Race Course Road and Hempshire Road at 9.23pm.
Police officers are at scene and are dealing with the situation, said the Police in a statement.
The public is advised to keep away from the affected area.
Further updates will be given when available.