Tankers remain blocked from the largest French oil port of Fos-Lavera at the weekend as workers extended a 24-hour strike that began on Thursday.
The strike stopped 21 oil tankers from entering the port, or from being loaded or unloaded, authorities said in a statement.
France's main union for port workers, part of the Confédération Générale du Travail (CGT), last month called for weekly 24-hour strikes to protest against government reforms and proposed privatization.
Normal operations at the Fos-Lavera terminals, part of the state-run Autonomous Port of Marseilles (APM), have been disrupted and tankers have had to wait for berthing.
According to Reuters, a new stoppage was called for Monday, June 9.