Belgian police arrested 16 people during operations in Brussels but failed to catch the man responsible for the attacks in Paris.
Hacker group Anonymous have declared war against ISIS following the attacks in Paris last week that killed 132 people, a self-described member said in a video.
Paris bombed Raqqa city on Sunday night in response for aggressive strike launched by the Islamic State group a few days ago.
ISIS claims responsibility for attacks that killed 129 people and wounded 352, of which 99 remain in a critical condition. The series of co-ordinated attacks began shortly after 9pm with gunfire a restaurant in the Bastille area of the city