When war engulfed Sudan's capital last month, it quickly spread to the western Darfur region, reigniting an old conflict and sending a wave of refugees over the border into Chad.
Nasr Abdullahi sent his wife, sister and five children to Chad last week, staying behind to wait for news of a 17-year-old son in the capital Khartoum. But when his neighbour's house was burned down and gangs took over the streets, he fled too.
