The Chinese city of Wuhan, the original epicentre of the coronavirus outbreak, has revised the number of virus-related fatalities up by 1,290 to 3,869, local authorities said.

The government of Hubei province, home to Wuhan, said in a statement that the number of casualties has been revised up due to late reports from medical institutions and due to the fact that some coronavirus patients died at home while hospitals were overloaded in the early stages of the epidemic.

The revision comes as the accuracy of China's coronavirus data has been questioned abroad and by its own citizens.

The total number of confirmed coronavirus cases in Wuhan was revised up by 325 to 50,333, the government said.