Refugees from war-torn Yemen fleeing intense airstrikes are arriving in the Horn of Africa nation of Djibouti, aid agencies said Wednesday, warning of a possible large influx ahead.

While a total of 238 refugees from Yemen have registered in Djibouti in recent weeks, the U.N. refugee agency UNHCR said, preparations were being made for many more.

Kenya's police chief issued Wednesday a list of 85 people and companies, including at least 13 key money transfer companies, of suspected links to Somalia's al-Qaida-linked Shebab.

Top of the list issued in an official government gazette notice was alleged Shebab commander Mohamed Mohamud, said to be the mastermind behind the university massacre of almost 150 people last week. 

Scattered books and dark blood stains on the floor: the bodies have been collected but an abbatoir-like stench permeates the Kenyan university where Islamist gunmen massacred 148 people last week.

In the now quiet grounds, police and soldiers stand under the shade of trees, where students once sat studying or chatting with friends.

Kenyan fighter jets pounded Al-Qaida-linked Shebab insurgent camps in southern Somalia on Monday, the army said, days after the Islamists killed 148 people in their worst ever massacre in Kenya.

The airstrikes, which the army said destroyed two Islamist bases, came on the second day of national mourning in Kenya, and as security forces tried to hunt down those behind the university killings.

The Cairo-based top Sunni Muslim body Al-Azhar on Saturday condemned the massacre of nearly 150 people at Kenya's Garissa University by Somalia's Shebab Islamists.

Four militants from the al-Qaida-linked group killed 148 people, 142 of them students, and wounded at least 79 at Garissa university after a day-long siege on Thursday.

They came in their hundreds, fearful of attacks but determined to honor the victims of one of Kenya's worst ever massacres.

In Nairobi's Anglican cathedral, every seat was packed for the Easter Sunday service at the start of three days of official national mourning for the 148 Kenyans killed in Thursday's attack by Somalia's Shebab Islamists.

Authorities in Kenya said Sunday they have identified one of the four dead Shebab gunmen who massacred nearly 150 people at Garissa University as an ethnic-Somali Kenyan national and law graduate.

Interior ministry spokesman Mwenda Njoka named one of the attackers as Abdirahim Abdullahi, saying he was "a university of Nairobi law graduate and described by a person who knows him well as a brilliant upcoming lawyer."

Islamist gunmen who massacred sleeping students in Kenya's Garissa university knew what they were doing: they picked a soft target put further at risk by crippling corruption and mismanaged security, analysts say.

The killing on Thursday of 148 people by Somalia's Al-Qaida-linked Shebab militants was meant to strike at the heart of Kenya's society and economy, said Abdirashid Hashi, director of the Somalia's Heritage Institute for Policy Studies.

Kenyan police have named homegrown militant Islamist Mohamed Mohamud, a soft-spoken former teacher, as the alleged mastermind of the massacre of 148 people in a university in Garissa.

Known also by the alias “Kuno”, as well as “Dulyadin” and “Gamadhere” -- meaning "long armed" and "ambidextrous" -- the alleged Shebab member is also wanted in connection with a string of recent cross-border killings and massacres in Kenya's northeastern border region.

Kenya said Saturday it had arrested five men in connection with the university massacre by Somalia's Al-Qaeda-linked Shebab militants that left nearly 150 people dead.

The arrests came as militants warned of "another bloodbath" and a "long, gruesome war" unless Kenya withdrew its troops from Somalia.