Ethical arguments and legal threats looked unlikely to deter US media from delving ever deeper into the hacked emails of Hollywood powerhouse Sony Pictures Entertainment.
Apple said its iCloud server has been the target of "intermittent" attacks, after a security blog said Chinese authorities had been trying to hack into the system.
Internet hackers briefly took over an Israeli army Twitter account, the military said, posting an alarming message that a nuclear facility had been hit by rocket fire.