It has been revealed that the UK government was involved at the highest level in pressuring the Guardian newspaper over its revelations about cyber-snooping by intelligence agencies.

The revelations follow protests over the detention of David Miranda, the partner of Glenn Greenwald, one of the journalists involved in publishing former US security contractor Edward Snowden's leaks.

Now it has emerged that Prime Minister David Cameron told the UK's most senior civil servant to demand the newspaper hand over the leaked documents.

Al Jazeera's Harry Smith reports.

Source: Al Jazeera