the garissa university an attack named by the government spoke to cnn over the weekend. he said his son went missing after graduating law school in 2013. the father said he had really given up on his son. for more let s bring in christian purefoy live in garissa. tell us about the $215,000 reward for the mastermind of the attack. reporter: yes, the interior minister kenya has named mahmoud as the killer of the 147 people minutes people. he is in control of the groups that come across through attacks and incursions in kenyan territory. that is his region of operations. that border is a four-hour long drive of dirt and track from