Hackers have successfully launched an attack on a French TV network which experts say is a new level of sophistication. The group, which says it is allied to terrorist organisation Islamic State, managed to take 11 TV channels off the air at TV5 Monde and also took control of its social media accounts and websites. The attack happened on Wednesday night and on Thursday the network was still restricted to broadcasting recorded programmes as live capabilities were compromised. Officials in France have launched a terrorism investigation over the incident. Rob Pritchard, a cybersecurity expert, says that the hackers may have targeted hundreds of TV networks before getting lucky with TV5 Monde. Investigators will look at whether there was a single weakness in the network’s systems or something more widespread.