How Snowden helped terror groups

At least three terror groups plotting attacks against Britain have changed their communication methods since the leaks by Edward Snowden, it was claimed last night.

The Al Qaeda-linked networks have altered their tactics since the fugitive stole intelligence files from GCHQ and the US National Security Agency, according to a report.

Extremist websites have also moved to protect their digital communications by releasing encryption programmes for followers, making it harder for extremists to be tracked down.