Investigators have questioned a young woman they suspect gave birth to a fetus found in a restroom on a Continental Airlines plane after it landed in Houston, police said Monday.

No charges had been filed against the unidentified juvenile because investigators were awaiting autopsy results to determine if a crime occurred, said police spokesman John Cannon.

He said test results should tell police if the fetus was born alive or stillborn.

Preliminary autopsy results would not be available until at least Tuesday, said Beverly Begay, a spokeswoman for the Harris County medical examiner.

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Cannon said he did not immediately know the girl's age or where she was from.

A cleaning crew at Bush Intercontinental Airport found the fetus in a waste bin in a restroom on the plane after the Boeing 737 landed Sunday afternoon on a nonstop flight from New York's LaGuardia Airport.

"We talked to a number of passengers and located a particular juvenile we are questioning," Cannon said. "The juvenile has possible involvement as the one who gave birth."

"All indications are it occurred sometime on the flight," he said.

Houston police were involved because the fetus was discovered within city limits, but if the autopsy determines the fetus was born alive during flight the FBI would take over the investigation, Cannon said.

Julie King, a spokeswoman for Houston-based Continental Airlines, declined to comment Monday.