RANGELY, Maine (AP) — A planetary science field researcher from Arizona is seeking help finding a fireball recorded last week streaking across the sky by police in Maine.

The bright flash was apparently left by a meteor burning up in Earth's atmosphere.

The U.S. Naval Observatory says the object was probably a space rock somewhere between the size of a toaster and a refrigerator.

The Maine Mineral & Gem Museum suspects the meteor crashed into the woods in northwestern Maine. It's offering a $20,000 reward for a piece of the meteorite weighing at least 2.2 pounds.

WCSH-TV reports (http://on.wcsh6.com/1TVs1Bu ) people have flocked to Rangely, including researcher Robert Ward. He says the rock must be tested soon or risk having its chemistry changed.

Witnesses are asked to file a report with the American Meteor Society.

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Information from: WCSH-TV, http://www.wcsh6.com