Twenty-six people were hurt and authorities made 15 arrests on Tuesday as protests in Paris over disputed labour reforms descended into violent clashes between riot police and masked troublemakers.
Strikes halved French train services on Thursday but attempts by the militant CGT union to broaden protests against labour reforms to air traffic control and the Paris underground appeared to have failed.
France's fuel supply crisis is not yet over, the transport minister warned, while Prime Minister Manuel Valls was quoted as saying he was ready to ride out protests at ports and fuel depots by strikers.
