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Footage posted on 6 February shows this crossing point at Jebel Awliya dam about 40 km south of Khartoum, blocked by badly damaged vehicles, with black smoke visible in the distance.

The search will cover a 15,000 sq km area in the southern Indian Ocean, under a "no find, no fee" agreement with the exploration firm Ocean Infinity.

"Who will be able to determine who violated the potential ceasefire agreement over a distance of 2,000 km and where exactly?" he asked.

Located about halfway between Australia, Antarctica and Madagascar, the island has seen burning across more than 55% of its 54 sq km area.

In a statement to BBC Verify, a spokesperson for Greenpeace said the group estimated that oil from the spill now covered an area totalling up to 400 sq km.