Darfur region sees surge in violence as conflict escalates in Sudan

Over 3.1 million people have been displaced in Sudan due to fighting between the military and paramilitary forces.
At least 87 people were found killed in a mass grave in West Darfur, attributed to paramilitary forces.
UN and rights groups are calling for investigations into killings, displacement and sexual violence in Darfur.
Clashes between rival factions have spread from the capital to other cities and Darfur.
Neighboring countries are hosting hundreds of thousands of refugees fleeing violence and instability in Sudan.