The death toll in the weekend mass shooting in Canada is now “in excess of 19 victims,” the Royal Canadian Mounted Police said at a press conference Monday.

Authorities fear there are more because they are looking at 16 crime scenes as the shooter, who police eventually shot dead, drove through in a series of small towns across the province of Nova Scotia, killing people as he went.

It is Canada’s worst mass murder, surpassing the 14 women shot to death in Montreal in Dec. 6, 1989.

Prime Minister Justin Trudeau devoted his daily COVID-19 address Monday to

Read more: Canada shooting death toll rises to 19