DAR ES SALAAM, Tanzania — Africa’s youngest billionaire, who was abducted over a week ago outside a luxury hotel in Tanzania, has returned home safely, the family conglomerate that he runs said on Twitter on Saturday.

The billionaire, Mohammed Dewji, 43, who is chief executive of METL Group, was seized as he arrived for a morning workout in the commercial capital, Dar es Salaam, last week.

“I have returned home safely,’” the METL Group Twitter account posted. The company also quoted him as thanking those who had worked for his release, including the police.