April 2, CNN reports eyewitness account as follows:

Christian Prayer Service Targeted

Joel Ayora, who was on the campus and witnessed the attack, said gunmen burst into a Christian service. Taking hostages from the service, they then “proceeded to the hostels, shooting anybody they came across except their fellows, the Muslims.”

The attackers separated students by religion, allowing Muslims to leave and keeping an unknown number of Christians hostage, Agence France-Presse reported. “We were sleeping when we heard a loud explosion that was followed by gunshots and everyone started running for safety,” student Japhet Mwala told AFP.

“There are those who were not able to leave the hostels where the gunmen headed and started firing. I am lucky to be alive because I jumped through the fence with other students.” For hours after the attack began, heavy gunfire and explosions continued, said Dennis Okari of CNN affiliate NTV.

Link to full article:  http://www.cnn.com/2015/04/02/africa/kenya-university-attack/

Attack Was Planed, Targeting Christians

According to he Huffington Post, the attack was specifically planned to target and take out Christians.

“GARISSA, Kenya (AP) — The Islamic extremists who slaughtered 147 people at a college in Kenya as they shouted “God is great” appeared to have planned extensively, even targeting a site where Christians had gone to pray, survivors said Friday.

Police on Friday were at the campus of Garissa University College, taking fingerprints from the bodies of the four assailants and of the students and security officials who died, for thorough identification purposes. The northeastern Kenyan town lacks the facilities to store all the bodies.

Link to the full acticle: http://www.huffingtonpost.com/2015/04/03/kenya-attack-survivors_n_6999204.html