1: The Kenyan government says Mohamed Mohamud is the mastermind of Thursday 's terrorist attack on Garissa University College . 2:  This is a man who has a lot of grudges against the Kenyans ,  said Stig Jarle Hansen , an associate professor at Oslo 's Norwegian University of Life Sciences and author of  Al-Shabaab in Somalia : The History and Ideology of a Militant Islamist Group .  3: Al-Shabaab 's Mohamed Mohamud  has a lot of grudges against the Kenyans ,  expert says .
1: Mohamed Mohamud 2: a man who has a lot of grudges against the Kenyans 3: Al-Shabaab 's Mohamed Mohamud