By Jonathan Davies

Apple has announced plans to tighten the security of its online backup service iCloud after nude images of several celebrities were leaked earlier this week.

iCloud already sends alerts to users when a new device tries to gain access to their account and when their is an attempt to reset their passwords. But Apple chief executive Tim Cook announced that Apple will now send alerts when data is restored to other devices as well.

Mr Cook told the Wall Street Journal: "When I step back from this terrible scenario that happened and say what more could we have done, I think about the awareness piece.

"I think we have a responsibility to ratchet that up. That's not really an engineering thing."

An anonymous hacker claimed to have hacked iCloud, but a later investigation found that there was no evidence of a hack and it was more likely that the celebrities' login information had been obtained.

The likes of actress Jennifer Lawrence, model Kate Upton, musician Arianna Grande and many more had images leaked and published online.

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