Belgian police faced off with protesters marching against COVID-19 restrictions on Sunday, firing tear gas and water cannon at the crowds gathered in the Cinquantenaire park in central Brussels.
A sandwich shop and the European External Action Service building were damaged during the protest, with glass broken and debris inside and outside the buildings.
Earlier protesters had thrown wood at the police.
Prime Minister Alexandre De Croo announced Friday that people will need booster shots after five months to maintain COVID-19 passes giving access to bars or cinemas.
That five-month limit is among the tightest in Europe. For neighboring France, it is seven months, while the EU-wide guide for travel within the bloc is set at nine.
The COVID-19 infections in Belgium are at their peak now at 40,929 new infections reported each day.
There have been 2,697,239 infections and 28,780 coronavirus-related deaths reported in the country since the pandemic began.