Violence around the city of al-Fashir in Darfur, Sudan, has blocked a recently opened humanitarian corridor from Chad and time is running out to prevent starvation in the vast region, the U.N. World Food Programme said on Friday. Attacks around al-Fashir, the Sudanese army’s last holdout in Darfur and home to some 1.6 million residents, have led to dire warnings of a new wave of mass displacement and inter-communal conflict in Sudan’s year-old war. The conflict between the army and the paramilitary Rapid Support Forces (RSF) has also led to worsening hunger, with some people eating soil or lea…