UN Secretary-General Kofi Annan yesterday urged immediate action to end the Darfur crisis in Sudan after hearing accounts of destruction and abuse during a visit which he described as "heart-wrenching". On the second day of his tour of Sudan, Annan was confronted with the devastation caused by more than two years of fighting between ethnic minority rebels and government forces. He kicked off his trip to the western Sudanese region with a visit to Kalma, Darfur's largest camp for displaced people, where he listened to tribal leaders' accounts of human rights violations. Annan then went to Labado, a town which was largely destroyed in the fighting last year and where thousands of returned residents greeted him with desperate calls for relief and protection."Heart-wrenching," Annan