In a statement, Moussa Faki Mahamat said "the two brotherly countries" should settle any disagreement peacefully.

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Ethiopian and Sudanese forces have clashed at the disputed al-Fashaga border area following the alleged capture, execution and public display of the bodies of seven Sudanese soldiers and a civilian killed over the weekend.

Sudan said on Tuesday that it had recaptured parts of its territory that were being held by the Ethiopian army.

The al-Fashaga area is where the north-west of Ethiopia's Amhara region meets Sudan's breadbasket, Gedaref state.

It has been contested for decades but tensions have increased over the last year with regular skirmishes reported between the two countries.