Twitter Inc said on Wednesday that it had started rolling out an optional two-step authentication regime for its users to thwart hackers.
The Associated Press, Britain's Financial Times and Daily Telegraph newspapers have all previously succumbed to attacks from the self-styled Syrian Electronic Army.
ITV's London news Twitter account @itvlondon was hijacked on Friday afternoon and used to promote spoof stories about Syrian rebels, before the hackers tweeted "Just kidding. The Syrian Electronic Army was here. #SEA via @Official_SEA12."
One of the hackers' tweets linked to a newspaper story headlined: "In battle against hackers like the Syrian Electronic Army, Twitter introduces extra security measures."
ITV, Britain's largest free-to-air commercial broadcaster, said on its national Twitter account that it was aware that it had been infiltrated and it was working to return to normal service as soon as possible.
An ITV spokesman said: "The ITV News London Twitter account was compromised for a short time but has now been secured and the Tweets have been deleted."
The spokesman said the security breach was triggered by a phishing email. He did not know if the new authentication system was in place on the account hacked.
(Reporting by Paul Sandle. Editing by Jane Merriman)
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