French rail workers, teachers, doctors, lawyers and others joined the fourth nationwide day of protests and strikes on Thursday to denounce President Emmanuel Macron’s plans to overhaul the pension system.

As the government and unions pushed on with crucial negotiations about the changes, street protests were staged in Paris and other French cities, and the railway strikes that began Dec. 5 entered their 36th day.

The Paris march, which unions said comprised 370,000 demonstrators, started from the Republique square in the city center and was accompanied by a large police presence. The Elysee presidential palace was barricaded as protesters were due to head toward the area. Police said by late afternoon that they had made over a dozen arrests.