The man said to be Africa's youngest billionaire has been kidnapped by masked gunmen in Tanzania's main city Dar es Salaam, police say.

Mohammed Dewji, 43, was abducted outside a swanky hotel gym where he was going for his routine morning workout.

Three people have been arrested in connection with the incident and two of the abductors were believed to be foreign nationals, police added.

The motive for Mr Dewji's abduction is still unclear.

Financial magazine Forbes puts his wealth at $1.5bn (£980m), and has described him as Tanzania's only billionaire.

In a 2017 report, it said Mr Dewji was Africa's youngest billionaire.

Mr Dewji is also a major sponsor of one of Tanzania's biggest football teams, Simba.

He promised in 2016 to donate at least half his fortune to philanthropic causes, Forbes said. (BBC)