Then, on July 21, 2005, the transit system was again disrupted by terrorism. Several men attempted to stage an attack mimicking the July 7 bombings. Fortunately, none of the four explosive devices placed on three trains and one bus detonated completely, and no one was injured Six men eventually were arrested, and by July 2007, four had been convicted of conspiracy to murder. At least one of these felons cited the British role in the Iraqi War as motivation for the attempted attack.