An investigation by a security analysis group has found evidence of Islamic extremists operating at a university in London. Activities on university campuses have been under scrutiny by UK authorities after Omar Farouk Abdulmutallab, a Nigerian man allegedly tried to blow up an airliner bound for Detroit last Christmas Day. He spent three years studying at a university in London including time as the president of the university's Islamic Society. Henry Ridgwell has this report from London.