UK Daily Mail 
June 14, 2013
Airlines around the world have been warned by the British government not to allow CIA whistle-blower Edward Snowden to board any flights to the UK.
The global alert has been issued to carriers warning the former US intelligence worker, who leaked details of the controversial Prism web spy programme, ‘is highly likely to be refused entry to the UK’.
It marks a major escalation in Britain’s involvement in the snooping scandal, after Foreign Secretary William Hague repeatedly refused to comment on the leaks.
The warning to airlines was made on a Home Office letterhead dated on Monday, the Associated Press reported. The document is thought to be genuine but the Home Office refused to comment.