The UN called for a swift inquiry into the "profoundly distressing" deaths of nine children in a US bombing in Afghanistan. "This incident, which follows similar incidents, adds to a sense of insecurity and fear," special UN envoy Lakhdar Brahimi said in a statement. The US has admitted mistakenly killing the children on Saturday in a strike on a suspected "terrorist". A spokesman said the US military regretted the loss of innocent life. A commission has been formed to investigate the incident, he said.