Father of suspect in foiled attack had relayed concerns to U.S. Embassy , source says . Britain 's Home Secretary Alan Johnson said Saturday he is following developments closely and has assured the public that police in Britain are working closely with U.S. investigators `` to uncover the full background to the incident . '' Father feared son went to Yemen to be part of `` some kind of jihad , '' source tells Northwest . American , 23 , charged with trying to destroy Northwest flight on approach to Yemen . CNN in London granted him a 23 visa in June 2008 , source says .
Father of suspect in foiled attack had relayed concerns to U.S. Embassy , source says . Father feared son went to Yemen to be part of `` some kind of jihad , '' source tells Northwest . American , 23 , charged with trying to destroy Northwest flight on approach to Yemen . CNN in London granted him a 23 visa in June 2008 , source says .