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There was some light rumbling under Lake Ontario late Wednesday caused by a minor earthquake.

The U.S. Geological Survey says the 2.9 quake happened just before midnight, 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.

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