State highway department officials say they still don`t know who put al-Qaida messages on a state computer server. The FBI and other federal agencies are investigating, trying to determine if the incident was a hoax or if actual terrorists had tapped into the computer`s server. Department officials discovered July 12th that one of their unsecured servers contained audio and video files from an al-Qaida-linked Web site. The appearance of the material in a state computer prompted the federal Homeland Security Department to wonder about the security of other state computers. The state says its other systems were unaffected.