Lisbon — Angolan billionaire Isabel dos Santos will leave her job in the administration of telecoms operator Unitel as tensions continue among board members, Portugal’s news agency Lusa reported on Tuesday.

“After 20 years dedicated to the creation, development and success of Unitel, I chose to leave the position of member of the company’s board of directors,” Dos Santos, who holds a 25% stake in Unitel, said in a statement cited by Lusa...

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