says the humanitarian situation in sudan is now catastrophic with mass displacement of people. our senior africa correspondent anne soy has been watching developments from the kenyan capital nairobi. every chance they get, sudanese are trying to flee the capital, khartoum, if only they can make it out alive. a 24 hour cease fire to allow families to reunite and aid to flow should be in force now. but there are reports still of gunfire and explosions. pressure is mounting on the warring generals to negotiate. some have been caught up in crossfire, like these engineering students of khartoum university who were forced to bury their flatmate