US President George W. Bush says he is frustrated with the pace of UN efforts to end a wave of killings in Sudan's Darfur region. The president spoke to reporters after meeting with Dr. Halima Bashir, who was tortured and gang-raped after speaking out about rapes of girls as young as eight near her remote clinic in Darfur. For her safety, Bashir was covered head to toe in a red, black and white sheath. Bush held a copy of Bashir's book about the years of brutality, titled, "Tears of the Desert." He said the United Nations must expedite sending peacekeepers. The conflict in Darfur has claimed the lives of up to 300,000 people and displaced more than 2.5 million, according to UN officials. The government in Khartoum argues that the numbers are exaggerated.