A cyber-attack on Twitter platform Tweetdeck has infiltrated several accounts, and re-tweeted garbled code.
The coding vulnerability hit several high profile accounts, including BBC Breaking News and that of Labour leader Ed Miliband.
The service was temporarily taken offline, but Tweetdeck later said it had fixed the flaw, and restored the web app.
It did not ask users to change their passwords.
The attack, which was carried out through a “cross-site scripting”, or XSS vulnerability, re-tweeted messages from several bogus identities, and sent incomprehensible alerts to some users.
Tweetdeck originally advised its users to just log out and sign back in, saying this would correct the problem.
However several users reported continued attacks.
The company then tweeted that it was taking down the service until the matter was fully resolved.
Tweetdeck, a British company that was acquired by Twitter in 2011, allows users to collate different feeds.
The service tweeted that it was closing down its site in order to assess the attack
The service has been subject to similar attacks in the past.
Earlier on Wednesday, news aggregator Feedly suffered a cyber-attack which disrupted access to its service, and on Tuesday, note-taking app Evernote fell victim to a similar assault.