The websites of the New York Times, the Huffington Post and Twitter were hacked by a group known as the Syrian Electronic Army which posted messages supporting the embattled Syrian President Bashar al-Assad.
A twitter handle of the Israeli army was taken over by Internet hackers, who posted a message warning that a nuclear facility in Israel has been hit by two rockets, causing a brief torrent of panic.
The British Broadcasting Corporation, the world's largest and oldest broadcaster, reportedly fell victim to a hacker who tried to sell access to the system over Christmas.