shadow standing in front of matrix background computers hacking
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Unknown hackers carried out a series of coordinated attacks against the websites of a number of leading Swedish newspapers Saturday night, Radio Sweden reported, citing police sources.

Among the attacked newspapers were Aftonbladet, Expressen, Dagens Nyheter, Svenska Dagbladet, Dagens Industri and Sydsvenskan, the source said.

"Similar attacks happened in the past, but they were never coordinated," Anders Alkvist, an expert on cybercrime and security, told Radio Sweden.

That's why the Saturday attacks were the biggest cybercrime in Sweden's history, Alkvist said.

"Right now, it's important to gather all available facts and understand what exactly happened," he said.

According to statistical data provided by Netnod, a Swedish Internet infrastructure organization, there was an increase of online traffic coming from Russian Internet-providers on Saturday night. However, Swedish experts said it doesn't mean that the attacks were carried out by Russian hackers, as perpetrators could have simply used Russian networks, Radio Sweden reported.


Comment: According to an article at Phys.org, the attacks were likely distributed denial of service (DDoS) attacks:
Several experts quoted in the media suggested the sites were subjected to distributed denial-of-services (DDoS) attacks, in which hackers hijack multiple computers to send a flood of data to the target, crippling its computer system.
What this means is that if any of the traffic came from Russia, it was likely from individual's computers that were infected with a virus or malware there, without their knowledge, and had nothing to do with Russia or the Russian government. Tracing where those attacks came from is likely challenging, if not impossible, so the person or persons directing the attacks could be located anywhere.


Shortly before the websites of Swedish newspapers were brought down, a warning was posted on Twitter using an anonymous account. The warning tweet said that the websites of newspapers that "spread false propaganda" would be attacked.

According to the Local, about an hour later, a second tweet said: "This is what happens when you spread false propaganda."

The scale of the cyberattacks is said to have been "extremely dangerous and serious," said Jeanette Gustafsdotter, the head of the Swedish Media Publishers' Association.

"To threaten access to news coverage is a threat to democracy," Gustafsdaughter said, as cited by the Local.

The Swedish police have launched an investigation.