Police confirmed the blast occurred after the tanker crashed in the Morogoro region, 124 miles west of port city of Dar es Salaam.
Commander Mutafungwa affirmed that majority were burnt beyond recognition.
The wrecked tanker attracted a large crowd of people trying to collect fuel, Stephene said.
Rescuers remove burnt motorbikes from the scene where a fuel tanker exploded killing a crowd of people collecting liquid from puddles in jerry cans in Morogoro, eastern Tanzania August 10, 2019.
A witness on the scene, teacher January Michael, told the French news agency AFP, "We arrived at the scene with two neighbors just after the truck was overturned".
"At the same time, someone was trying to pull the battery out of the vehicle".
A spark ignited the fuel causing a massive explosion.
Tanzanian President John Magufuli sent his condolences to the families of those who died in the accident.
Correspondents say disasters like this have happened all too frequently in parts of Africa where some people are willing to take huge risks to remove fuel from tankers and pipelines. "I have never experienced this ghastly situation before", said Kebwe.
In one video on social media, a police officer is seen helping a man from the flames as the sounds of another explosion can be heard in the background.
On July 2, more than 50 people were killed and another 70 were wounded in Nigerian state of Benue in an oil tanker explosion.
"Unfortunately fire broke out and burned a lot of people, a lot of people have lost their lives in this incident", he said.
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