A heavy rainstorm in Toronto caused power outages and transit chaos across Canada’s largest city on Monday, with flooding shutting down parts of its subway and major roads.

Some drivers had to abandon their vehicles as the water in underpasses and low spots rose up to their windows.

Toronto Hydro, the main electrical utility, said some 300,000 customers lost power after the sudden storm, which dumped more than 90 millimetres (3.5 inches) of water on parts of the city.

The rain also flooded subway stations, closing down large parts of three subway lines, the city’s public transit operator said. Many streetcars and buses in the downtown area were forced to stop or divert.