evidence: There is little else to do in the border town of Wadi Halfa, where a local support group says upwards of 20,000 displaced people live in limbo, unable to cross the northern frontier into Egypt and escape the five-month war between the Sudanese army and paramilitary Rapid Support Forces. [...] But in June, Cairo tightened its visa rules to include children, women and older men, which has slowed the flow of refugees across the border and kept many stuck in Wadi Halfa. [...] In August, the UN refugee agency reported that hundreds of commercial trucks carrying food and hygiene products were stuck at the border waiting to cross into Sudan, causing "the delay of essential goods reaching Wadi Halfa" and other parts of Sudan.