In 2004 , al-Suri and Abu-Musab were linked to the 2004 Madrid bombing through a series of money transfers and personal contacts . A Spanish court document went on to name al-Suri as Bin Laden 's " courier " in Europe . Another report refers to him as " a ' mid-level ' activist … and a ' member of Usama bin Ladin 's structures in Europe "
2004 Madrid bombing
2004 Madrid train bombings
Abu Khalid al-Suri