31.   Giuliani said it was believed the aftereffects of the plane crashes eventually brought the buildings down, not planted explosive devices.

32.   He feared terrorists might have planted the devices and planned to retrieve them.

33.   His flight took him through Amsterdam, where the National Police apparently planted the devices without notifying the Schiphol Airport, Northwest Airlines, pilots or Holloway.

34.   However, Yitzhaki said it was also possible the device was planted by Jewish militants.

35.   Investigators are checking whether the device was planted by Palestinian militants, the report said.

36.   Israeli forces and guerrillas commonly plant explosive devices planted on possible infiltration routes on the edge of the Israeli-occupied zone in the south.

37.   Instead, they believe, it is possible the devices were planted on the planes while they were parked on the tarmac by someone with access to the aircraft.

38.   It was not clear if an explosive device was planted in the car.

39.   It was not immediately clear who planted the devices.

40.   It was not clear where the suspected rebel planned to plant the device.