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(CNN) —  

The captain of an overloaded ferry that capsized on Lake Victoria has been arrested as Tanzania mourns more than 200 people killed in the latest maritime disaster in the East African nation.

Tanzanian President John Magufuli said the captain is in custody and ordered the arrest of all the other operators of the ferry, which capsized Thursday.

Magufuli told the nation in an address Friday that the captain left the ferry’s steering in the hands of a person not trained for the job, The Citizen newspaper reported. The death toll rose to 209 on Saturday, government spokesman Hassan Abbas told CNN, but it’s expected to go up as more bodies are pulled out of the water.

Initial reports indicated that overloading contributed to the deadly disaster, but an investigation will determine the exact cause, the Tanzanian leader said.

It’s unclear how many passengers were aboard the ferry. There are reports it had a capacity to carry 100 people, and it was carrying an estimated 400 instead.

Engineer rescued

Rescuers worked for hours to pull survivors out of the frigid waters Thursday and Friday, and they are still searching for hundreds who were likely onboard the overcrowded ferry.

“It’s been a bit difficult because of the fact that the ferry overturned with people and luggage,” Transport Minister Isack Kamwele said. “We have to remove the luggage first to get to the bodies.”

An engineer from the ferry was among the people rescued Saturday, the state-run Tanzania Broadcasting Corp. reported. He was among eight engineers aboard the ferry when it capsized, and he’d locked himself inside the engine room since Thursday.

’He … said he was in trouble’

Fisherman Maulid Musa said he received a phone call from a friend aboard the ferry moments before it capsized.

“He called me and said he was in trouble,” Musa told The Citizen. “That the boat he was traveling in was about to sink. I tried to ask him what was happening. He said all the passengers on board had moved to one side of the boat. Then the phone went off.”

Musa said he tried to rush to the scene to help, but there were no boats going there. He found out Friday his friend had died.

The ferry was traveling from Bugolora to Ukara Island when it capsized 200 meters (about 650 feet) from its destination. Thursday is a market day on the island, and many passengers were traveling to Gulio market there.

Lake Victoria is the largest lake in Africa, straddling the borders of Tanzania, Uganda and Kenya.

Ferries in Tanzania are often overcrowded, with the lack of an accurate passenger manifest complicating rescue operations. The disaster highlights the issue of dangerous overcrowding on ferries in the region.

In 2011, some 200 people were killed after an overloaded vessel – carrying more than 1,000 passengers despite an official capacity of 620 – hit strong winds off the island of Zanzibar in the Indian Ocean.

CNN’s Stephanie Busari, Farai Sevenzo, Jennifer Hauser and Bethlehem Feleke contributed to this report.