A pro-Islamic State (IS) hacker group, cyber revenge army, brought down the police website in the southern Indian state of Karnataka on May 21, declaring a "cyber war", a police official said, reports Sputnik News. A few hours later the website was restored, a Karnataka police official added. "This is beginning of our cyber war on you infidels and this hacking is in retaliation for the Daesh soldiers and for their support", the message read on the website before it was restored.