A call by France’s main trade unions for a day of action in ongoing pension reform protests drew an estimated 370,000 people Thursday in Paris alone, up 20,000 from the previous mobilization on Dec. 15.

Green, purple, yellow and red flags could be seen covering the Place de la Republique brought by the Service National Universel (SNU), General Confederation of Labour (CGT) and rail operator SNCF.

Giant balloons to match bobbed in the wind, and songs of solidarity could be heard from workers from public transport operator RATP. Even the Paris Opera had a presence.

A group from the

Read more: Workers take to streets across France in day of action