Thousands of peaceful protesters demonstrated in Brussels on Sunday for the third time against reinforced COVID-19 restrictions imposed by the Belgian government to counter a spike in infections as the omicron variant sweeps across Europe.

The marchers — some with placards reading “free zone,” “I’ve had my fair dose” and “enough is enough” — came to protest the government’s strong advice to get vaccinated. They also included Belgian health care workers who will have a three-month window in which to get vaccinated against the virus beginning January 1 or risk losing their jobs.

A strong police presence and widespread preventive controls were deployed for the march, given how previous protests had descended into violence. But only 13 arrests were made for “rebellion and possession of prohibited articles,” according to police spokesperson Ilse Van de Keere.

Also Sunday, the Brussels-based European Commission agreed with Pfizer-BioNTech to accelerate the delivery of vaccines starting in a few weeks. The pharmaceutical giant will deliver an additional 20 million vaccine doses from January to March to the European Union’s 27 nations.

The Belgian protest comes one day after similar protests in other European capitals including Paris and London. Nations across Europe are reimposing tougher measures to stem a new wave of COVID-19 infections spurred by the highly transmissible omicron variant, with the Netherlands leading the way by imposing a nationwide lockdown.