Sri Lanka's Galle Face Road was closed for several hours on Thursday due to workers from Hambantota port protesting, local papers reported.
Over a hundred port workers held placards and banners, blocking motorists from using the road. The cause of the protest remains unclear however.
The port which is part owned by a state-run Chinese company has been dogged with protests, with many Sinhala locals viewing the Chinese involving as a loss of sovereignty.
In October, a protester at Hambantota port was assaulted by a police officer.