All they are doing is saying it was a suicide bomber officially. Unofficially, they say there are two other people they want to question who left the scene. Since there was another bomb, would say it was a good chance there was at least one more and on local radio as well as from someone near the blast who was being interviewed when my daughter and I left my son's fraternity, would say at least two.
Jesus, Mary and Joseph.
As though OK hasn't already had enough bombings for a score of lifetimes.