Excellent point.  Suicide bomber detonating outside the concert hall AFTER the concert with big crowds at the exit since everyone is bunched up all trying to exit the stadium at the same time, with parents/ friends all waiting outside, so no way any security can identity a suicide bomber in such a fluid crowd.  ISIS is claiming responsibility and the suicide bomber, Salman Abedi, 22, came from Libya.  Hawaii needs to seriously rethink becoming a sanctuary city for Muslim refugees from Syria, Libya, Iraq or other Middle Eastern countries.  England and France have very lax immigration policies with tragic results and this problem of Muslim extremism killing innocent people, including children wilL NEVER go away.  Muslim extemists wil never go after someone like President Trump because he is too well protected so soft targets of ordinary citizens or tourists that are almost impossible to protect from attacks will always be their target.