KHARTOUM, July 13 (Reuters) - The Sudanese government has resumed bombing civilian targets in the war-ravaged western region of Darfur, the U.S. special envoy for Darfur said on Friday. "After a halt in the bombing between the beginning of February and the end of April in 2007, the Sudanese government has resumed bombing in Darfur," Andrew Natsios told a news conference in Khartoum following a visit to Darfur.