Federal investigators have identified several passengers who may have unwittingly carried aboard the bomb that blew up Pan Am Flight 103 over Scotland on Dec. 21, a Bush administration official said Thursday.

CBS-TV news reported that suspicion for having planted the bomb was focused on a member of the Popular Front for the Liberation of Palestine-General Command who is a relative of Hafez Dalkamoni, who CBS said reportedly set up the network that carried out the attack.An administration official knowledgeable about the investigation disputed the CBS account that investigators believe the passenger who unwittingly carried the bomb was Khalid Jaafar, a young American-Lebanese college student returning to Michigan from Frankfurt for the Christmas holidays.

Federal Bureau of Investigation agents have questioned Jaafar's parents at the family run gas station in Detroit, but the parents insist he was not involved.

The official said Jaafar was only one of several passengers suspected.