Transcript for Northwestern University Student Missing After Party
-- being fired is now is missing the wait continues as the search widens dogs on the ground. Divers in the water. They scoured -- -- harbor after a review of harsh Amadou was cell phone records revealed his phone -- off a nearby cell tower. Less than an hour after the northwestern university's student left an off campus party. That being would have been early Saturday morning sometime around 1 AM shortly -- after. And based on that it is believed that this is his last -- this is the closest to his last location. How he or his phone may have gotten here remains a mystery police believe the -- that left the off campus party on ridge road in Evanston just after midnight. The harbor in -- and parking is two miles to the north. And not in the direction of his dorm -- campus. The question of whether he left the party alone or whether he was with the group is what the university police in Evanston police are trying to nail down right now. We just don't know the answer that right -- -- -- and says. 1 AM in the morning. That -- have any idea. The -- his family says the eighteen year old was a book -- not an adventure seeker. As their search finishes its fifth day they hope a 25000. Dollar reward they are now offering. Will generate new clues as to how and why is straight a student. Simply disappear. Any information. They -- Exactly it's still -- -- my son please I'm on my big event home.
This transcript has been automatically generated and may not be 100% accurate.