MI5 chief Andrew Parker: Social media companies must reveal details of terror threats

The head of MI5 has launched an unprecedented attack on social media companies, saying they have a “responsibility” to pass on intelligence of potential terrorism.

Andrew Parker, Director General of the Security Service, questioned why internet companies would not come forward if they had suspicions of a terror risk.

He also warned Britain was facing its gravest threat from fanatics and his agency had foiled six major plots to attack this country in the last year – the highest he has ever known.