TORONTO — Tens of thousands of Ontarians are without power as an ice storm pummels parts of the province and threatens even more.

A map from Hydro One, the provincial utility, shows roughly 35,000 customers were in the dark because of outages concentrated in cottage country, from Tobermory and Parry Sound to Peterborough.

Environment Canada has issued freezing rain warnings for swaths of Ontario and Quebec that begin on the northwestern shore of Lake Huron.