<sod >A judge saidÃÂÃÂ Ahmed Hassan, 18, failed to cause the "carnage" he desired when his device malfunctioned but remains a danger to the public.< eod>< sod > A judge saidÃÂÃÂ Ahmed Hassan, aged between 18 and 21, failed to cause the "carnage" he desired when his device malfunctioned but remains a danger to the public.< eod>