Sudan extends the use of the Adre border crossing with Chad as it is essential to aiding agencies for food delivery and other supplies to famine-risk areas in Darfur and Kordofan regions.
Around 40 soldiers were killed in an attack on a military base in Chad's Lake region on Sunday, the central African country's presidency said on Monday.
Sudan's warring military factions agreed on Monday to a five-day extension of a ceasefire agreement after renewed heavy clashes and air strikes in the capital.