Anonymous, the online international group of self-described anarchist hackers, has announced that it will launch a new series of cyber attacks on Turkish websites tonight in protest of a government-planned Internet filtering system.

After hitting the Spanish police headquarters (three alleged members of the group had been arrested last week by Spanish police) the group has been targeting Turkey by launching a number of cyber attacks on several government websites last Thursday.

The group has been active in Turkey protesting against government plans to set up a national net filtering system. Turkish police took action against the group following claims that the group planned to sabotage the Turkish elections by attacking the website of the country's election body, the Supreme Election Board (YSK). Turkish police have so far arrested 32 people believed to be members of the hacker collective Anonymous. Nine of them were later released.

In a statement released on Tuesday the group criticized news reports covering the arrests and said the new attacks will be stronger when compared to the previous ones. It also said it would not announce the names of the websites it plans to attack until the very last minute. But the group said it had decided not to attack political websites and media outlets.

Turkey's Internet regulator, the Information Technologies and Communication Authority (BTK), issued a directive earlier this year in which it said that as of Aug. 22, Turkish Internet users would need to sign up for one of four filters it would create: children, family, domestic and standard.