The death toll from Sunday's plane crash in Lake Victoria in Tanzania has jumped to 19, Prime Minister Kassim Majaliwa said, after the Precision Air flight with dozens of passengers aboard plunged into water while approaching the northwestern city of Bukoba.

"All Tanzanians are with you in mourning the 19 people who lost lives during this accident," Majaliwa told a crowd after arriving at Bukoba airport, where the flight had been scheduled to land from financial capital Dar es Salaam.

Regional authorities and the airline earlier said that 26 survivors out of the 43 people on board flight PW 494 had been pulled to safety and taken to hospital in the lakeside city in Kagera region.

It was not immediately clear if the 19 victims included rescuers who drowned or whether the 48-seater aircraft had more people on board than previously disclosed, a regional official said.

"We are continuing to investigate, there is a possibility that two people were not onboard but died during the rescue effort," said Kagera regional commissioner Albert Chalamila.

Precision Air, a publicly-listed company which is Tanzania's largest private airline, said it had dispatched rescuers to the scene.

"An investigation team consisting of Precision Air technical staff and TAA (Tanzania Airports Authority) has also departed to join the rescue team on the ground," the airline said in a statement.

"Precision Air sincerely understands the anxiety for confirmed information and will therefore do its best to issue more details," the company said.

It said the aircraft was an ATR 42-500, manufactured by Toulouse-based Franco-Italian firm ATR.

Video footage broadcast on local media showed the plane largely submerged as rescuers, including fishermen, waded through water to bring people to safety.

Emergency workers attempted to lift the aircraft out of the water using ropes, assisted by cranes as residents also sought to help.

President Samia Suluhu Hassan expressed her condolences to those affected by the accident.

"Let's continue to be calm while the rescue operation continues as we pray to God to help us," she said on Twitter.

 

- 'Hearts and prayers' -
 

The African Union Commission chair Moussa Faki Mahamat also shared his condolences, as did the secretary general of the regional East African Community bloc, Peter Mathuki.

"Our hearts and prayers go to the families of passengers on-board a plane that crashed into Lake Victoria, with our full solidarity to the Government & people of #Tanzania," Faki wrote on Twitter.

"The East African Community joins and sends our condolences to Mama Samia Suluhu Hassan, families and friends of all those who were affected by the Precision Air plane accident," Mathuki said, also on Twitter.

Precision Air, which is partly owned by Kenya Airways, was founded in 1993 and operates domestic and regional flights as well as private charters to popular tourist destinations such as the Serengeti National Park and the Zanzibar archipelago.

The accident comes five years after 11 people died when a plane belonging to safari company Coastal Aviation crashed in northern Tanzania.

In March 2019, an Ethiopian Airlines flight from Addis Ababa to Nairobi plunged six minutes after take-off into a field southeast of the Ethiopian capital, killing all 157 people on board.

In 2007, a Kenya Airways flight from the Ivory Coast city of Abidjan to Kenya's capital Nairobi crashed into a swamp after take-off, killing all 114 passengers.

In 2000, another Kenya Airways flight from Abidjan to Nairobi crashed into the Atlantic Ocean minutes after take-off, killing 169 people while 10 survived.