http://www.mirror.co.uk/news/tm_objectid=15713116&method=full&siteid=94762&headline=were-the-bombers-british--name_page.htmlMadrid mastermind Mustafa Setmarian Nasar is still at large - and was widely believed to have been planning an attack on Britain.
He sets up sleeper cells then leaves his recruits to do their worst.
He also teaches them forgery techniques so they can fake identity papers. Two of his key players, both North African, had UK passports in the names of Frost and Burgess to make travel easier.
Nasar, who has a pale complexion, red hair and green eyes, often uses fake British ID.
He lived in North London in the mid-1990s and has been in close contact with two suspects in Belmarsh prison in South East London.
He also had links to one of Osama bin Laden's right-hand men, Abu Musab al-Zarqawi, who has urged his operatives to terrorise Britain.
Nasar, who has a $5million US Government bounty on his head, ordered the Madrid bombers to blow themselves up after they were cornered by police.