With investigators into the failed attack on an American airliner focusing on Yemen as the place where the bomber appears to have met operatives from al-Qaida and have prepared for the attack, Britain announced Friday that it would host an international summit meeting on combating Islamic radicalization in Yemen. Prime Minister Gordon Brown said that Yemen would be the focus of a meeting in London on Jan. 28, when world leaders will be meeting there to discuss the allied war effort in Afghanistan. He said in a statement that he had support for the meeting from the United States and the European Union, and that he would seek backing from Saudi Arabia and other Persian Gulf states. He said the meeting would discuss ways of enhancing airline security as well as 'how to counter radicalization' in Yemen in the light of the Christmas Day attack, when Umar Farouk Abdulmutallab, a 23-year-old Nigerian, tried to ignite an explosive device abroad a Northwest Airlines plane descending into Detroit. Brown said Britain would be seeking agreement at the London meeting on steps to help Yemen, 'as both an incubator and potential safe haven for terrorism,' to combat the threat. In addition to helping train and equip Yemen's counterterrorism forces, he said, the countries attending would look at ways of providing development aid to areas of Yemen 'most at risk of radicalization,' and of helping Yemen with a program of economic, social and political reform. 