The French government said it would see through planned pension reforms but said the new system that has sparked nationwide strikes would be introduced gradually and public concerns would be addressed.
Transport systems were paralysed for a fourth day on Sunday as unions at state railway SNCF and Paris public transport system RATP extended their strike against the changes.
Prime Minister Edouard Philippe has said he would present a detailed outline of the pension reform plan on Wednesday.
Deputy Environment Minister Emmanuel Wargon told radio France Info the government would be flexible about both the timelime and implementation of the reforms.
Unions plan a second demonstration on Tuesday, after a Thursday’s first protest attracted 65,000 people in Paris and 806,000 nationwide, according to police figures.