A group from Ontario's restaurant industry is calling on the provincial government to explain its decision to impose tighter COVID-19 restrictions on the sector.

A coalition that includes the industry association Restaurants Canada and a number of food service businesses has issued an open letter to Premier Doug Ford, asking to see what data the province relied on in setting its health measures.

The letter says no data have been provided so far that would suggest restaurants are a major point of transmission for the virus.

It notes restaurants have had to make significant investments in safety procedures and training, personal protective equipment and other measures, yet those in some regions are nonetheless being forced to stop serving customers indoors.

A document released yesterday by the province showed that in four COVID-19 hot spots -- where indoor dining is currently banned -- the proportion of outbreaks linked to restaurants and bars between Aug. 1 and Oct. 24 ranged between 3.2 and 27.14 per cent.

Ontario's chief medical officer of health, Dr. David Williams, said the provincial health table recommended targeting any "risk sites" where transmission could potentially be higher.