Kenya is holding three days of mourning for those who died in Thursday’s attack on students by al-Shabaab militants.br br So far only 54 of the 148 victims have been identified by their distraught relatives.br br Almost all those killed at Garissa University were students, another 79 were injured.br br a prayer for the victims #KenyaAttack #Kenya pic.twitter.comsAgkAHCIyp— Anto ʘ‿ʘ (@BresciaAnto) April 5, 2015br br br A massive investigation is under way to try to find the suspected mastermind behind the attack. The authorities are offering a reward for the capture of Mohamed Mohamud. br br It has also emerged that one of the four gunmenbr who raided the university seeking out non Muslims to kill has been identified as the son of a government official. He has been named as Abdirahim Abdullah, an ethnic Somali with Kenyan nationality. br br Police have now stepped up security not only in Garissa but in several major cities at shopping malls, and other public buildings.