The attack hit the websites for newspapers Aftonbladet, Expressen, Dagens Nyheter, Svenska Dagbladet, Dagens Industri, Sydsvenskan and Helsingborgs Dagblad and lasted for an hour or longer.
Karin Olsson, Espressen's deputy editor-in-chief, tells Radio Sweden that the daily paper first noticed something was wrong about 8:20 pm.
"The news site was down and we noticed that our competitors Aftonbladet had great problems updating and giving access to its readers," Olsson says.
After an hour, Olsson says the paper was able to "manage" the attack and redirect the incoming traffic that was deliberately targeting the site. Olsson says that Expressen can only speculate why media outlets were singled out.
Shortly before the sites become inaccessible, an anonymous Twitter account alluded to the cyber attack against the media writing that "this is what happens when you spread false propaganda Aftonbladet.se #offline @Aftonbladet".