Landmine-clearing NGO chief explains how explosives still kill in peacetime, why world is failing to clean up its wars.
Port Sudan, el-Fasher, West Kordofan and West Darfur have all seen heavy fighting.
The US Constitution ensures all immigrants have due process, but rights depend on legal status and time spent in the US.
Ceasefire halts conflict that was spiralling towards a full-scale war.