New evidence uncovered by BBC Arabic suggests the FBI may have hidden material linking Omar al-Bayoumi, a Saudi national long suspected of ties to intelligence services, to the 11 September 2001 attacks. The evidence indicates that al-Bayoumi — who repeatedly denied being an extremist or a spy — spent time in the United States with a future al-Qaeda leader and Saudi officials in the period before the attacks. The allegations are significant because families of 9/11 victims have spent years pursuing lawsuits against Saudi Arabia, and any suppressed FBI evidence could have direct bearing on those legal proceedings.