Tanzanian billionaire Mohammed Dewji has been released, 9 days after he was kidnapped in Dar Es Salaam.

Police have said they’re hunting for the perpetrators of the crime that threatened to spook investors in East Africa’s second-largest economy.

Dewji, listed by Forbes as Africa’s youngest billionaire with a net worth of $1.5bn, was dropped off in an area of Dar es Salaam, Tanzania’s main city, by his kidnappers, police Inspector General Simon Sirro said Saturday.

The Mo Dewji Foundation, a charity established by the billionaire, announced his release early Saturday.

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In a Twitter post, it quoted Dewji thanking “the authorities of Tanzania, including the police force for working for my safe return.”

The 43-year-old was seized by unidentified people in the Tanzanian commercial hub of Dar es Salaam on October 11.

It was the latest worrying turn for Tanzania, once described as an “island of peace” in a turbulent region, but that has seen a recent spate of politically motivated violence.

There was no publicly announced demand for ransom; Dewji’s family offered almost $500 000 as a reward for information that led to his rescue.

Sirro said Saturday that an AK-47 rifle and three pistols were found in a car that was used by three kidnappers, two of whom spoke English and the other Swahili.

The police are in pursuit of the men and hopeful they’ll be arrested, he said, adding that Tanzania remains safe for investors.