 Around the time of the 2008 Summer Olympics torch relay, which was marred by unrest in Tibet, Chinese hackers claim to have hacked the websites of CNN (accused of selective reporting on the 2008 Lhasa riots) and Carrefour (a French shopping chain, allegedly supporting Tibetan independence), while websites and forums gave tutorials on how to launch a DDoS attack specifically on the CNN website.Some people form themselves into vigilante groups aiming (overtly) to expose injustice and cover-ups in high-profile criminal cases against innocent victims, often children.Recent cases include the death of JonBenét Ramsey in the US and the disappearance of the British girl Madeleine McCann in Portugal.