A report of suspicious material on a United Airlines (search) flight from New York to San Francisco prompted the pilot to make an emergency landing Tuesday at O'Hare International Airport (search).

The material turned out to be wires, an MP3 player and homeopathic medicines, said Transportation Security Administration (search) spokeswoman Ann Davis.

United spokesman Jeff Green and Chicago police would not say if anyone was taken into custody as the Chicago Police Bomb and Arson squad investigated the materials.

A passenger aboard the flight had told a flight attendant he saw another passenger with the suspicious material, Green said. He said the flight attendant and flight crew examined the material and recommended landing.

All 66 passengers and eight crew members aboard United Flight 27 were evacuated after the airplane landed, Green said. No one was injured.