AMSTERDAM—Dutch police detained more than 180 people in a third night of unrest in cities across the Netherlands, where roaming groups of rioters set fires, threw rocks, and looted stores in violence triggered by a night curfew aimed at curbing the coronavirus.

Burning objects are seen on a street amid COVID-19 curfew protests in Rotterdam, Netherlands, on Jan. 25, 2021, in this still image from video obtained from social media. Facebook, Instagram @Imadbenoffical via Reuters