Garissa - A man believed by Kenyan police to be the mastermind behind the terror attack on the Garissa University College is a Kenyan citizen and was a former school teacher and principal.A KES 20 million bounty (R650 000) has been placed on the head of the fugitive police say is called Mohamed Kuno. He has been on the run from law enforcement agencies since December.Kuno is a former teacher and principal at Madarasa Najah school in Garissa.According to police reports, he operates under three aliases: Sheikh Mahamad, Dulyadin and Gamadheere.The police report states that he joined the militants in Somalia at the time of the Islamic Courts Union, which later morphed into the current Al-Shabaab.Police also say that the suspect has fled into the lower parts of the country and urged vigilance from all Kenyans."I urge Kenyans to remain calm, but at the same time vigilant in the face of these attacks," Inspector General of Police, Joseph Boinett, said.Garissa Governor Mohammed Nadhif told News24 in an interview that he had no knowledge of who Kuno was."I have never heard about him and do not know him. It saddens me that he has come to kill locals, a place where he supposedly lived," he said.According to police, Kuno uses his family members to carry out terrorist activities in northern Kenya.He is also named as the Al-Shabaab’s leader for Juba region in Somalia, and is currently in charge of external operations against Kenya.