Investigators in Malaysia are voicing scepticism that the Malaysian airliner which disappeared early on Saturday was the target of an attack, say US and European government sources close to the probe.

A Florida company has admitted its files — not an FBI agent’s laptop — were hacked by a renegade group that released Apple product identification data it claimed to have obtained through a breach of the nation’s top law enforcement agency.

Computer users already anxious about viruses and identity theft have new reason to worry: Hackers have found a way to lock up the electronic documents on your computer and then demand €160 over the internet to get them back.