When Zougam's Madrid flat was searched, officers found videos of a Moroccan terror suspect who is known to have entered Spain using a bogus British passport. Police are also probing links between Zougam and Abu Dahdah. Dahdah is known to have met the London-based cleric Abu Qatada, known as Bin Laden's "European ambassador", who is being held in Belmarsh jail under anti-terror legislation.