In Pakistan, at least four people, including an Iraqi national and two women, were killed and six injured today when a suicide bomber struck at the UN food agency's office Islamabad. Interior Minister Rehman Malik told reporters that the bomber, who was disguised as paramilitary Frontier Corps personnel, entered the heavily-guarded World Food Programme (WFP) office .The bomber blew him up in the lobby of the WFP office, situated in the heart of Islamabad. Malik warned that the local Taliban, under pressure due to military operations being conducted in the Swat valley and the tribal areas, could carry out more suicide attacks. UN officials and people in nearby buildings were asked to evacuate the area after the blast, which occurred at 12.15 pm local time. About 80 people worked in the WFP office. The UN also closed all its offices in Islamabad and Rawalpindi till further notice.No group has so far claimed responsibility for the attack. However, Taliban spokesmen had recently said militants would carry out a fresh wave of suicide attacks to avenge the killing of their chief Baitullah Mehsud in a US drone attack in August.