On Sunday, the Chicago Police Department (CPD) and city of Chicago’s official websites were victims of a cyber strike seemingly performed by hacktivists affiliated with Anonymous. The strike was allegedly in retaliation for police violence toward NATO summit protesters. Calling themselves “AntiS3curityOPS,” the hackers reportedly sent a suggestive message to the CPD via a YouTube video that has since been removed. The group took to its Twitter account Sunday to address the hacks, stating, “We neither confirm nor deny any allegations made against us in regards to the NATO and Chicago Police Dept. hacks.” The websites are currently up and running once again. The Federal Bureau of Investigation is investigating the cyber assault.