Delta Plane Turned Around Mid-Flight After Suspicious Wires Found

Authorities fearing terror in the sky turned around a flight to Madrid shortly after it took off from New York when a federal air marshal spotted suspicious wires in a rear lavatory.

The flight, Delta 126, is now back on the ground at New York's JFK airport. Port Authority Police, New York City's Bomb Squad and members of the FBI Joint Terrorist Task Force are there.

Passengers were taken off the flight in a "controlled evacuation," sources told ABC News. But so far there is no evidence of a bomb.

Nonetheless, authorities are proceeding with caution and intend to interview the person who found the wires -- apparently one of a team of armed federal air marshals aboard the flight.

Although numerous reports suggested suspects were in custody, authorities initially said those appeared inaccurate. But the situation was developing.