LONDON, England – A website that police say was behind millions of cyberattacks has been closed following a series of international arrests.

Europol said Wednesday morning that it’s shut down Webstresser.org, a page that carried out distributed denial-of-service attacks for a price, sometimes as cheap as $18.26 a month. The page had more than 136,000 users and carried out 4 million attacks by April, according to Europol, the European Union Agency for Law Enforcement Cooperation.

DDoS attacks are capable of taking out websites and servers by flooding an address with so many requests that it’s forced offline. In 2016, the Dyn attack managed to temporarily shut down major websites like Twitter, Spotify and Reddit. Hackers need access to a massive amount of devices to carry out these attacks — usually with hijacked internet of things (IoT) gadgets — but websites like Webstresser.org could offer that service to anyone willing to pay.

That meant criminals didn’t need the technical expertise to carry out massive cyberattacks on websites, opening the door to millions of new victims.

“Stresser websites make powerful weapons in the hands of cybercriminals,” Jaap van Oss, the Dutch chairman of the Joint Cybercrime Action Taskforce, said in a statement.

On-demand DDoS attacks are available online, some from niche groups like a Grand Theft Auto mods community. Europol said Webstresser was the world’s largest provider.

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