The US National Secutiry Agency (NSA) has knew about the Heartbleed bug for at least two years before it was revealed, according to Bloomberg.
One person 'familiar with the matter' told the news agency that the NSA preferred to keep the bug secret in order to harvest the private data the flaw exposed.
More top news
Warm sunny skies into Easter Monday
Free Derry Corner has had a tribute to murdered journalist Lyra McKee added to its iconic mural.
A helicopter was brought in to drop tonnes of water on the fire and police are warning people to stay well clear.