AMSTERDAM, Nov 22 (Reuters) - Dutch Prime Minister Mark Rutte on Monday lashed out at "idiot" rioters who rampaged through cities across the Netherlands this weekend when protests against coronavirus restrictions turned violent. More than 100 people were arrested during three nights of violence, which saw police open fire at rioters in Rotterdam on Friday. read more "This was pure violence disguised as protest," Rutte said in response to the worst disturbances since a full lockdown led to widespread disorder in January. "There is a lot of unrest in society because we have been dealing with the misery of corona for so long. But I will never accept idiots using pure violence just because they are unhappy." Around 30 people were arrested on Sunday, following dozens of arrests on the previous two days, as mobs of youths set fires and threw rocks. Black-clad groups pelted police vans with stones, and in The Hague a rock was thrown through the windshield of an ambulance trying to take a patient to hospital. A protester throws a bicycle at a police vehicle in Rotterdam, Netherlands November 20, 2021, in this screen grab obtained from a social media video. Video recorded November 20, 2021. Sven Simcic - Video In Verzet via REUTERS A man stands with a flare as protesters watch a motorcycle burning in Rotterdam, Netherlands November 20, 2021, in this screen grab obtained from a social media video. Video recorded November 20, 2021. Sven Simcic - Video In Verzet via REUTERS A protester throws a bicycle at a police vehicle in Rotterdam, Netherlands November 20, 2021, in this screen grab obtained from a social media video. Video recorded November 20, 2021. Sven Simcic - Video In Verzet via REUTERS 1/2 A man stands with a flare as protesters watch a motorcycle burning in Rotterdam, Netherlands November 20, 2021, in this screen grab obtained from a social media video. Video recorded November 20, 2021. Sven Simcic - Video In Verzet via REUTERS Violence began in Rotterdam on Friday night, as a protest against government plans to ban most people who have not been vaccinated from public places quickly turned violent. Although some lockdown measures were reimposed in the Netherlands on Nov. 13, infections have surged. read more This has forced Dutch hospitals to scale back regular treatment, and put pressure on the government to ensure care remains available for all urgent cases. The head of the Dutch hospital association for critical care LNAZ, Ernst Kuipers, said the first Dutch patient would be moved to an intensive care unit in neighbouring Germany to take some pressure off Dutch hospitals on Tuesday. Dutch health authorities on Monday reported more than 23,000 new coronavirus infections in 24 hours, the second highest number since the start of the pandemic. Health minister Hugo de Jonge stressed the country was "far removed" from the worst-case scenario, where hospitals would not have enough intensive care beds for every patient that needed one. However the government would consider more restrictions if infections and hospitalisations kept rising, he added.