US warned a week ago about Baghdad UN bomb Le 21 08 2003 Karl Ritter, US authorities in Iraq were warned last week that a large-scale terrorist attack on a 'soft' target in Baghdad was being planned. The warning emerged as rescue teams searched the wreckage of the bombed UN headquarters where at least 20 people, including the senior UN envoy Sergio Vieira de Mello, died in yesterday's suicide truck bombing.