A tornado touched down in the community of Grand Bend on Sunday.

Environment Canada says an EF1 twister – with winds between 155 and 175 km/h hit the area Sunday night.

Meanwhile, more than 4,000 Hydro One customers in the Grand Bend area remained without power today after a violent storm ripped through southwestern Ontario.

Hydro One spokeswoman Dana Gardner says crews were working to restore power and that all homes and businesses were expected to be back online by 11 p.m. tonight.

The twister in the Grand Band area – about 70 kilometres northwest of London – was part of the storm that knocked down utility poles and trees.

Provincial police say one injury was reported during the storm, but they could not immediately confirm whether it was storm-related.