MI5 also accused of not telling judges about failing to delete bulk surveillance data
Weakening encryption would open the country up to more threats, says Jonathan Evans
Investigatory Powers Tribunal dismissed secret services' bulk data collection following lobbying by MI5
"Improper" agreement meant IPT was unable to properly fulfill
Security services allowed to run riot with citizens' personal data collected in bulk, hears Investigatory Powers Tribunal
MI5 chief says Twitter, Facebook, should be monitoring users and notifying authorities about suspects
Andrew Parker says social media firms can help to tackle crime and prevent terrorists from 'going dark'
MI5 warns top companies that their IT staff are being targeted