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PHILADELPHIA (AP) _ Prosecutors have dropped charges against a woman who was arrested after security screeners found a loaded gun in her bag at Philadelphia International Airport.

U.S. Attorney Patrick Meehan said Monday that the gun belonged to Nancy Keller's husband and that there wasn't enough evidence to prove she knew it was in her bag.

Prosecutors declined to say how the .357-caliber semiautomatic got into a zipper compartment in Keller's carry-on bag.

Keller, 37, of Huntersville, N.C., was making a connection in Philadelphia on a flight from Atlanta on Aug. 25 when a screener saw the gun on an X-ray machine. She had been charged with boarding an aircraft with a concealed weapon.

The screener who apparently missed the weapon at Hartsfield Atlanta International Airport was later fired.

Keller's attorney, Stuart Patchen, did not return a phone call Monday.