Authorities have now confirmed the identity of one of the four slain Garissa terrorists, as Abdirahim Abdullahi, a lawyer by profession.

The slain terrorist is one of the four men who stormed the Garissa University College on Thursday morning and executed 148 people, mainly students before three of them were shot dead by police. The fourth one blew himself up.

"It is true one of the four Al Shabaab militants who stormed Garissa University College killing 148 plus students has been identified as Abdirahim Abdullahi the son of a chief in Mandera County," Interior Spokesman Mwenda Njoka said following our inquiry.

He said the father had reported to authorities about his missing son whom they believed crossed to Somalia. Abdullahi is thought to have gone to Somalia in 2013.

"The father had reported to the authorities that his son had gone missing and suspected the boy had gone to Somalia," Njoka went on to say of the slain terrorist "who was a University of Nairobi law graduate and described by a person who knows him well as a brilliant upcoming lawyer."

Investigators have traced records at a secondary school he studied known as WAMY High School and established that he obtained an A- grade when he sat for his Kenya Certificate of Secondary School Examinations (KCSE) exam in 2007, according to the Interior Ministry Spokesman.

"It is indeed very necessary and critical that parents whose children go missing or show tendencies of having been exposed to violent extremism report to authorities to help prevent further escalation of radicalization," he said.

Police were still trying to identify the rest of the three slain terror suspects.