Apple CEO Tim Cook said in a Bloomberg interview that he could not reveal details, but said Apple had provided prompt assistance to the UK authorities.
“We have been cooperating with the U.K. government not only in law enforcement kind of matters but on some of the attacks,” he said. “I cannot speak on detail on that. But in cases when we have information and they have gone through the lawful process we don’t just give it but we do it very promptly.
Bloomberg says that it’s s “likely” that Apple provided data from iCloud backups of devices associated with the terrorists. Although data is encrypted for backup on iCloud, Apple doesn’t (yet) use end-to-end encryption, meaning that the company holds the key and can decrypt data when presented with a court order.
There have been three recent terrorist attacks in the UK: a suicide bombing in Manchester and two incidents where a vehicle was driven into people on bridges in London.