Mohammad Sidique Khan, one of London's four alleged July 7 suicide bombers, visited the mosque, where firebrand imam Abu Hamza al-Masri preached jihad until his arrest last year.

Hamza went on trial for inciting murder the same week as the first bombings.

Yasin Hassan Omar and Muktar Said Ibrahim - both of whom are suspects in the July 21 attacks - had told neighbors they also visited the Finsbury facility.

Police are also reportedly investigating whether Ibrahim, who is still at large, may have met convicted shoebomber Richard Reid at Finsbury Park before Reid was caught in December 2001.

Other notorious members of Imam Hamza's flock include Zacarias Moussaoui, the so-called 20th hijacker, who pleaded guilty to 9/11-related conspiracy charges, and James Ujaama, a Muslim convert from Seattle who was charged in 2002 with trying to set up a terrorist training camp in Oregon.

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