The question is, "Are They For US or Against US?"
http://www.truthusa.com/AgainstUSorForUS.html
E-PRISM.ORG - Global Research in International Affairs (GLORIA) Center - THE PROJECT FOR THE RESEARCH OF ISLAMIST MOVEMENTS (PRISM) - OCCASIONAL PAPERS Volume 3 (2005), Number 3 (July 2005) Director and Editor: Reuven Paz: "'FROM MADRID TO LONDON: AL-QAEDA EXPORTS THE WAR IN IRAQ TO EUROPE'" by Reuven Paz (pdf)
Shuttle Security Ping
Detectives also revealed that a suspected al-Qaeda operative entered Britain via a channel port two weeks before the attack. Although his name was on a security watch list he was not put under surveillance, as he was not regarded as being of sufficiently high risk. He is believed to have left the country hours before the attacks.