UK police question a suspected rogue trader at Swiss bank Zurich for a second time . Credit rating agency Moody 's says it is reviewing accounts for a possible downgrade . UBS itself reported the rogue trader to police , officers say . British media identify the arrested man as Kweku Adoboli .
UK police question a suspected rogue trader at Swiss bank UBS for a second day . Credit rating agency Moody 's says it is reviewing UBS for a possible downgrade . UBS itself reported the rogue trader to police , officers say . British media name the arrested man as Kweku Adoboli .