Kenyan authorities have identified one of the slain attackers of Garissa University as a lawyer and son of a local government official.

"One of the militants was positively identified as Abdirahim Mohamed Abdullahi, a lawyer who graduated from Nairobi University in 2013," Mwenda Njoka, a spokesperson for the Ministry of Interior, told The Anadolu Agency.

On Saturday evening there was a commotion in Garissa town after police publicly displayed the bodies of the slain Al-Shabaab militants to hundreds of local residents.

"We resorted to this measure with hopes that someone would identify them," Njoka explained.

Abdirahim was the son of Abdullahi Daqara, a Chief in Mandera County at a place called Bulla Jamhuri.

"His father reported to the police a year ago that his son had disappeared," said the spokesman.

"The father told us that he was a very bright student and we have confirmed that he was a law graduate," Njoka told AA. "The father has also positively identified the body of his son."

He said the father had heard reports that his son had joined Al-Shabaab militia and it was at this point that he had ceased to search for his son.

At least 149 people and four militants were killed in a deadly attack on Garissa University College on Saturday.

Somalia's al-Qaeda-linked Al-Shabaab group has claimed responsibility for the attack.

It has threatened more attacks in Kenya during Easter.

Al-Shabaab has vowed to carry out attacks in Kenya as long as the East African country keeps troops in Somalia.

In late 2013, Al-Shabaab gunmen stormed Nairobi's Westgate Mall, holding hundreds of victims hostage.

The four-day siege left 67 dead, including all of the assailants.