Dock workers briefly blocked traffic at the French port of Le Havre after two colleagues were arrested over earlier protest violence.

The regional administration for the Le Havre area said the port was blocked Wednesday morning but activity picked up again after midday. The administration said it began after two union activists were arrested over unrest at a protest earlier this year, which was targeting a labor law making it easier to fire workers and extend working hours.

The arrests came the same day that the head of leading union CGT, Philippe Martinez, came to Le Havre for meetings to plot new union action against the labor law. He insisted on France-3 television that "party activists are still mobilized" even though the law is already in force.