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UPDATE: N. Illinois Rattling a Quarry Blast, Not Earthquake
UPDATE: N. Illinois Rattling a Quarry Blast, Not Earthquake

The U.S. Geological Survey now says a quarry blast shook northern Illinois at a magnitude 3.7.

The agency said earlier Monday afternoon that the rumbles were an earthquake. Later, the USGS updated its report to say the shaking was a quarry blast in the southwestern Chicago suburb of Countryside.

The agency says the shaking struck Indian Head Park in Cook County around 12:35 p.m. It was about 1.4 kilometers deep.

Indian Head Park is about 16 miles southwest of Chicago and has about 3,800 residents.

There were no immediate reports of damage or injuries.