A minor earthquake caused some light rumbling under Lake Ontario east of Toronto late Wednesday, the U.S. Geological Survey says.

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The U.S. Geological Survey says the 2.9 magnitude quake happened just before midnight, 40 kilometres southwest of Cobourg, Ont. (Google)

The quake, which had preliminary magnitude of 2.9, happened just before midnight. The epicentre was 40 kilometres southwest of Cobourg, Ont., and 57 kilometres northeast of Lockport, N.Y.   

A map on the agency's website shows the epicentre in the middle of the lake. The agency says it was about five kilometres deep.

The U.S. Geological Survey posts reports on its website from people who report feeling an earthquake. As of 8:20 a.m. Thursday, six people reported feeling the quake — three in upstate New York and three in Ontario.

The three Ontario reports came from Cobourg, Waterford and Port Hope.

With files from The Canadian Press