The situation across the Netherlands remained tense but without major unrest on Tuesday night after three nights of violence in protest against the government's implementation of tough restrictions to curb the spread of the coronavirus.

Police took to the streets of towns and cities across the country to prevent violent rioting, while businesses closed early and shops boarded up.

On Tuesday when the 9 p.m. curfew went into effect, rowdy crowds of youths gathered in Amsterdam and Hilversum, but were broken up without incident. In Rotterdam, 33 people were detained for violating social distancing regulations and vandalism.

That was in stark contrast to Monday night, when rioting rocked cities across the country and more than 180 people were arrested for burning vehicles, stone-throwing and widespread looting.

"This was truly a different picture to yesterday," National Police chief Willem Woelders told Dutch public television. "We did not need to use the riot police or other forces."

But he cautioned that one night of comparative quiet did not mean they could let down their guard. "We have to remain alert," Woelders said.

'They won't get away with it'

The rioting, which started with the torching of a coronavirus testing center in a fishing village on Saturday night, is the worst to hit the Netherlands in years.

It was initially triggered by anger over a tough coronavirus lockdown that has been in force since mid-December but degenerated into vandalism by crowds whipped up by messages swirling on social media.

The violence has stretched the police and led at times to the deployment of military police. On Monday night, rioters pelted police with rocks, fireworks and Molotov cocktails and looted shops in at least two cities, Rotterdam and Den Bosch.

Justice Minister Ferd Grapperhaus said earlier on Tuesday that rioters would quickly be brought before the courts and face possible prison terms if convicted. "They won't get away with it," he told reporters in The Hague.

Rotterdam Mayor Ahmed Aboutaleb posted a video message on Twitter, asking rioters: "Does it feel good to wake up with a bag full of stolen stuff next to you?" He also appealed to parents of the young rioters, asking: "Did you miss your son yesterday? Did you ask yourself where he was?"

"This criminal violence must stop," Prime Minister Mark Rutte tweeted. "The riots have nothing to do with protesting or struggling for freedom," he added. "We must win the battle against the virus together, because that's the only way of getting back our freedom."

Situation remains serious

The curfew, the first in the country since World War II, was imposed after the National Institute for Health (RIVM) warned a new wave of infections was on its way owing to the risk posed by new and more infectious variants, though numbers of new infections in the Netherlands have been declining for weeks.

Violators of the 9 p.m. to 4:30 a.m. curfew, which is set to last until at least February 10, face a €95 ($115) fine. Exemptions are allowed, for example for people having to work, attend funerals or walk their dogs, on condition that they present a certificate.

The Netherlands was already under its toughest measures since the start of the pandemic, with bars and restaurants having closed in October, and schools and non-essential shops shut since December.

Coronavirus infections have been falling in recent weeks, with the number of new cases down by 8% over the past week. A little under 4,000 new infections were reported on Tuesday in the Netherlands, the smallest daily increase since November 24.

But the RIVM said the situation was still very serious as a result of the more contagious variant that has caused a massive surge in cases in Britain.