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Minister of Health Saia Piukala said the two Covid cases that led to the current lockdown are baffled by their infection reports Kaniva News.

Piukala said the duo did not recall any situation while working at the wharf that could lead them to believe a breach was responsible for their infections. 

Piukala previously denied rumours that the source might link to the Australian helicopter carrier, HMAS Adelaide, which arrived in Tonga last week.

More than 20 of its crew have been infected and are self-isolating on board.

Boris Johnson told the BBC stronger measures may be required in parts of the country in the coming weeks.

He said this included the possibility of keeping schools closed, although this is not "something we want to do".

Labour leader Sir Keir Starmer has called for new England-wide restrictions within 24 hours.

Sir Keir said coronavirus was "clearly out of control" and it was "inevitable more schools are going to have to close".

It comes as the UK recorded more than 50,000 new confirmed Covid cases for the sixth day in a row, with 54,990 announced on Sunday.