A suicide bomber attacked the UN headquarters in Baghdad on 22 September, killing an Iraqi and injuring at least eight. US military official Sean Kirly announced that that blast at the Canal Hotel, scene of the 19 August bombing that killed UN special envoy Sergio Viera de Mello and 21 others, had killed one Iraqi security guard and wounded eight. Witnesses said that the bomb was detonated about 250 metres from the hotel after a confrontation between the bomber and a policeman. The area has been sealed off by US forces.