Secrets leaked by computer analyst Edward Snowden have put lives at risk, a senior counter-terror police officer has warned.
Assistant Commisioner Cressida Dick said she agreed with a claim made by MI6 chief Sir John Sawers that terrorists would be "rubbing their hands with glee" at the disclosures.
She said: "I've spoken to all the agency heads on a number of occasions. They see what's going on every day.
"They see the evidence, and I think even if you don't do that, if you look at some of the things which have been apparently revealed you can see immediately how that would affect people's way of working.
"It will be putting, I believe, people's lives at risk, whether they are agents, sources or members of the public."