"I've spoken to his father and the news of the kidnap of our friend Mo is true", State Minister for Environment and Union Affairs January Makamba said on Twitter.
METL is worth more than $1 billion and "employs 24,000 people in industries including agriculture, manufacturing, energy and petroleum, financial services, mobile telephony, infrastructure and real estate", according to the company's website.
With a reputation as one of East Africa's leading forces in regional trade and business development, Dewji served in parliament from 2005 until 2015.
Mohammed Dewji has huge celebrity status in Tanzania.
Reports from the scene suggest two white men and an unknown number of accomplices in two cars waylaid the prominent businessman as he walked into the exclusive Colosseum Hotel and Fitness Club, where he is a member.
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The UN chief argued that legal representation or transparent criminal proceedings might have spared them from the death penalty. Amnesty International has called on governments to put an end to the death penalty.
"They came in a auto to the hotel and started shooting in the air before they took him away".
Police have thrown a security cordon around the country as the hunt for abducted Tanzanian billionaire Mohammed Dewji got underway.
An Uber driver nearby said when Mr Dewji appeared, the auto parked inside flashed lights before the two white men alighted from their vehicle and went straight to where Dewji was.
Are kidnappings common in Dar es Salaam? . And Dar es Salaam is very safe, in comparison to Lagos or Johannesburg, the main cities in Nigeria and South Africa respectively.
Businessmen have never felt at risk of being kidnapped and they often move around on their own. So Mr Dewji's abduction has come as a huge shock.