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A woman raises her arm to not be hit with a stick after she stumbled while trying to move away, as Kenyan security forces move the crowd back, before displaying the bodies of the alleged attackers before about 2,000 people in a large open area in central Garissa, Kenya Saturday, April 4, 2015. Authorities displayed the bodies of the alleged attackers involved in the killings at Garissa University College on the bed of a pickup truck that drove slowly past the crowd, which broke into a run in pursuit. (AP Photo/Ben Curtis) ( Kenya University Attack )

A survivor of an attack by islamist gunmen claimed by al-Shabab on a university campus in Garissa, northern Kenya is comforted by a colleague after arriving in Nairobi on April 4, 2015. Kenya's President, Uhuru Kenyatta vowed Saturday, to retaliate in the severest way against Somalia's al-Shabab islamists after they massacred nearly 150 people at a university. AFP PHOTO/Tony KARUMBA/AFP/Getty Images ( 539447599 )

A stands looking at Kenyan Defense Force officers, as people gather to view the bodies of the suspected attackers on the Garissa university in the northeastern town of Garissa on April 4, 2015, two days after the gunmen from Somalia's Shebab Islamists stormed the Garissa University campus killing some 148 people, included 142 students, three police officers and three soldiers, Interior Minister Joseph Nkaissery said. Four assailants from Somalia's Shebab Islamists were also killed. AFP PHOTO / CARL DE SOUZA/AFP/Getty Images ( 539442140 )

Members of the public gather outside the hospital mortuary, as they wait to view the bodies of the alleged attackers, in Garissa, Kenya, Saturday, April 4, 2015. Later authorities displayed the bodies of the alleged attackers involved in the killings at Garissa University College on the bed of a pickup truck that drove slowly past the crowd gathered in a large open area. (AP Photo/Ben Curtis) ( Kenya University Attack )

A woman covers her mouth after going in to view the bodies of the alleged attackers, having been encouraged to do so by security guards, at the hospital mortuary in Garissa, Kenya Saturday, April 4, 2015. Later authorities displayed the bodies of the alleged attackers involved in the killings at Garissa University College on the bed of a pickup truck that drove slowly past the crowd gathered in a large open area. (AP Photo/Ben Curtis) ( Kenya University Attack )

A man is helped after he viewed the body of a relative killed in Thursday's attack on a university, at Chiromo funeral home, Nairobi, Kenya, Saturday, April 4, 2015. Al-Shabab gunmen rampaged through a university in northeastern Kenya at dawn Thursday, killing scores of people in the group's deadliest attack in the East African country. Four militants were slain by security forces to end the siege just after dusk. (AP Photo) ( Kenya University Attack )

A parent raises her hands to thank God as some of the 663 students who survived the Garissa University College terror attack arrive in Nairobi Nyayo stadium, Kenya, Saturday April 4, 2015, where their family members were waiting. Al-Shabab gunmen rampaged through a university in northeastern Kenya at dawn Thursday, killing scores of people in the group's deadliest attack in the East African country, with four militants slain by security forces. (AP Photo) ( Kenya University Attack )

Members of the public climb and hang onto window frames to get a view as authorities display the bodies of the alleged attackers before about 2,000 people in a large open area in central Garissa, Kenya Saturday, April 4, 2015. Authorities displayed the bodies of the alleged attackers involved in the killings at Garissa University College on the bed of a pickup truck that drove slowly past the crowd, which broke into a run in pursuit. (AP Photo/Ben Curtis) ( Kenya University Attack )

A hospital security guard covers his mouth and nose due to the smell as he views the bodies of the alleged attackers laid out on the slab and floor, in the hospital mortuary in Garissa, Kenya Saturday, April 4, 2015. Later authorities displayed the bodies of the alleged attackers involved in the killings at Garissa University College on the bed of a pickup truck that drove slowly past the crowd gathered in a large open area. (AP Photo/Ben Curtis) ( Kenya University Attack )

A woman cries after she viewed the body of a relative killed in Thursday's attack on a university, at Chiromo funeral home, Nairobi, Kenya, Saturday, April 4, 2015. Al-Shabab gunmen rampaged through a university in northeastern Kenya at dawn Thursday, killing scores of people in the group's deadliest attack in the East African country. Four militants were slain by security forces to end the siege just after dusk. (AP Photo) ( Kenya University Attack )

A hospital security guard drives members of the public back behind a line as they gather outside the hospital mortuary, waiting to view the bodies of the alleged attackers, in Garissa, Kenya Saturday, April 4, 2015. Later authorities displayed the bodies of the alleged attackers involved in the killings at Garissa University College on the bed of a pickup truck that drove slowly past the crowd gathered in a large open area. (AP Photo/Ben Curtis) ( Kenya University Attack )

An injured man, Cheruiyot Baffin is assisted to get aboard a bus, taking the surviving students to their respective home counties at the Garissa military camp, in Garissa, Kenya, Saturday, April 4, 2015, after Al-Shabab gunmen rampaged through a university in northeastern Kenya at dawn Thursday, killing scores of people in the group's deadliest attack in the East African country, and leaving four militants killed by security forces. Somalia's Islamic extremist group al-Shabab on Saturday warned of more attacks in Kenya like the assault on Garissa University College in which 148 people were killed. (AP Photo) ( Kenya University Attack )

A woman is allowed to retrieve her shoe lost during a panicked rush by the crowd, as Kenyan security forces move the crowd back, before displaying the bodies of the alleged attackers before about 2,000 people in a large open area in central Garissa, Kenya Saturday, April 4, 2015. Authorities displayed the bodies of the alleged attackers involved in the killings at Garissa University College on the bed of a pickup truck that drove slowly past the crowd, which broke into a run in pursuit. (AP Photo/Ben Curtis) ( Kenya University Attack )

A woman is consoled after she viewed the body of a relative killed in Thursday's attack on a university, at Chiromo funeral home, Nairobi, Kenya, Saturday, April 4, 2015. Al-Shabab gunmen rampaged through a university in northeastern Kenya at dawn Thursday, killing scores of people in the group's deadliest attack in the East African country. Four militants were slain by security forces to end the siege just after dusk. (AP Photo) ( Kenya University Attack )

Women in the crowd cover their faces to protect against the smell as authorities display the bodies of the alleged attackers before about 2,000 people in a large open area in central Garissa, Kenya Saturday, April 4, 2015. Authorities displayed the bodies of the alleged attackers involved in the killings at Garissa University College on the bed of a pickup truck that drove slowly past the crowd, which broke into a run in pursuit. (AP Photo/Ben Curtis) ( APTOPIX Kenya University Attack )

Three students of the 663 students who survived the Garissa University College terror attack arrive in cheerful mood in heavy rain downpour in Nairobi Nyayo stadium, Kenya, Saturday April 4, 2015, where their family members were waiting. Al-Shabab gunmen rampaged through a university in northeastern Kenya at dawn Thursday, killing scores of people in the group's deadliest attack in the East African country, with four militants slain by security forces. (AP Photo) ( Kenya University Attack )

A Kenyan security man wears a mask as he stands guard in the Garissa mortuary in the northeastern town of Garissa, on April 4, 2015, two days after gunmen stormed the Garissa University campus killing some 148 people, included 142 students, three police officers and three soldiers, Interior Minister Joseph Nkaissery said. Four assailants from Somalia's Shebab Islamists were also killed. AFP PHOTO / CARL DE SOUZA/AFP/Getty Images ( 539440071 )

A man holds a cloth to his face as he waits to view the body of a relative killed in Thursday's attack on a university, at Chiromo funeral home, Nairobi, Kenya, Saturday, April 4, 2015. Al-Shabab gunmen rampaged through a university in northeastern Kenya at dawn Thursday, killing scores of people in the group's deadliest attack in the East African country. Four militants were slain by security forces to end the siege just after dusk. (AP Photo/Sayyid Azim) ( Kenya University Attack )

Women look across as Kenya Defence Forces (KDF) soldiers arrive at a hospital to escort the bodies of the attackers to be put on public view, in Garissa, Kenya Saturday, April 4, 2015. Authorities displayed the bodies of the alleged attackers involved in the killings at Garissa University College on the bed of a pickup truck that drove slowly past the crowd gathered in a large open area. (AP Photo/Ben Curtis) ( Kenya University Attack )

A parent reacts as some 663 students who survived the Garissa University College terror attack arrive in Nairobi Nyayo stadium, Kenya, Saturday April 4, 2015, where their family members were waiting. Al-Shabab gunmen rampaged through a university in northeastern Kenya at dawn Thursday, killing scores of people in the group's deadliest attack in the East African country, with four militants slain by security forces. (AP Photo) ( Kenya University Attack )

An injured student Cheruiyot Baffin, is assisted into the stadium during heavy rain downpour, as some of the 663 students who survived the Garissa University College terror attack arrive in Nairobi Nyayo stadium, Kenya, Saturday April 4, 2015, where their family members were waiting. Al-Shabab gunmen rampaged through a university in northeastern Kenya at dawn Thursday, killing scores of people in the group's deadliest attack in the East African country, with four militants slain by security forces. (AP Photo) ( Kenya University Attack )

Women in the crowd cover their faces to protect against the smell as authorities display the bodies of the alleged attackers before about 2,000 people in a large open area in central Garissa, Kenya Saturday, April 4, 2015. Authorities displayed the bodies of the alleged attackers involved in the killings at Garissa University College on the bed of a pickup truck that drove slowly past the crowd, which broke into a run in pursuit. (AP Photo/Ben Curtis) ( Kenya University Attack )

Unidentified Americans who appeared to be working with the forensics investigation, wear masks after viewing the bodies of the alleged attackers, at the hospital morgue in Garissa, Kenya Saturday, April 4, 2015. Later authorities displayed the bodies of the alleged attackers involved in the killings at Garissa University College on the bed of a pickup truck that drove slowly past the crowd gathered in a large open area. (AP Photo/Ben Curtis) ( Kenya University Attack )

People cover their noses as they arrive to view the bodies of the suspected attackers on a university at the Garissa mortuary in the northeastern town of Garissa, on April 4, 2015, two days after gunmen from Somalia's Shebab Islamists stormed the Garissa University campus killing some 148 people, included 142 students, three police officers and three soldiers, Interior Minister Joseph Nkaissery said. Four assailants from Somalia's Shebab Islamists were also killed. AFP PHOTO / CARL DE SOUZA/AFP/Getty Images ( 539440539 )

A woman peers through a window at the bodies of the suspected attackers on a university held in the Garissa mortuary in the northeastern town of Garissa, on April 4, 2015, two days after gunmen from Somalia's Shebab Islamists stormed the Garissa University campus killing some 148 people, included 142 students, three police officers and three soldiers, Interior Minister Joseph Nkaissery said. Four assailants from Somalia's Shebab Islamists were also killed. AFP PHOTO / CARL DE SOUZA/AFP/Getty Images ( 539441563 )

A women holds a sign during an anti-terror demonstration on April 4, 2015 in Eastleigh, eastern district of Nairobi, two days after gunmen from Somalia's Shebab Islamists stormed the Garissa University campus, northern Kenya, killing some 148 people, included 142 students, three police officers and three soldiers. AFP PHOTO/AHMED MOHAMEDAHMED MOHAMED/AFP/Getty Images ( 539442533 )

Women weep in joy after seeing their relatives among survivors of an attack by islamist gunmen claimed by al-Shabab on a university campus in Garissa, northern Kenya, as the survivors arrive in Nairobi on April 4, 2015. Kenya's President, Uhuru Kenyatta vowed Saturday, to retaliate in the severest way against Somalia's al-Shabab islamists after they massacred nearly 150 people at a university. AFP PHOTO/Tony KARUMBA/AFP/Getty Images ( 539447584 )

A relative reacts after seeing her kin in Nairobi on April 4, 2015, among survivors of an attack by islamist gunmen claimed by al-Shabab on a university campus in Garissa, northern Kenya. Kenya's President, Uhuru Kenyatta vowed Saturday, to retaliate in the severest way against Somalia's al-Shabab islamists after they massacred nearly 150 people at a university. AFP PHOTO/Tony KARUMBA/AFP/Getty Images ( 539447827 )

Relatives react after seeing their kins arriving at the Nyayo stadium in Nairobi on April 4, 2015, among survivors of an attack by islamist gunmen claimed by al-Shabab on a university campus in Garissa, northern Kenya. Kenya's President, Uhuru Kenyatta vowed Saturday, to retaliate in the severest way against Somalia's al-Shabab islamists after they massacred nearly 150 people at a university. AFP PHOTO/Tony KARUMBA/AFP/Getty Images ( 539447949 )

A relative reacts after seeing her kin in Nairobi on April 4, 2015, among survivors of an attack by islamist gunmen claimed by al-Shabab on a university campus in Garissa, northern Kenya. Kenya's President, Uhuru Kenyatta vowed Saturday, to retaliate in the severest way against Somalia's al-Shabab islamists after they massacred nearly 150 people at a university. AFP PHOTO/Tony KARUMBA/AFP/Getty Images ( 539448031 )