How 4 Terrorists Killed 147 Students in Kenya

The al-Shabaab terrorists executed Christian students while reportedly letting all Muslims go.
2:12 | 04/03/15

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Transcript for How 4 Terrorists Killed 147 Students in Kenya
We want to get to that other headline. More than 140 students dead after terrorists affiliated with Al Qaeda storm a university in Kenya. The gunmen killing Christians while letting Muslim students go reportedly. ABC's Martha Raddatz is in Washington, D.C. With the latest on this massacre. Good morning, Martha. Reporter: Good morning, Lara. This morning, a survivor of the mass attack says the four gunmen seemed to have scouted the campus well in advance and knew exactly where they wanted to go heading first to a lecture haul where Christians were in early morning prayer. The terrifying massacre began before dawn. The sound of gunfire shocking students out of their beds, four Al shabaab terrorists moved from dormitory to dormitory separating muslims from Christians. Those who identified themselves as Christians were executed on the spot. Desperate students fleeing for hours, but many were held hostage in one of the dorm industries for hours escaping only after Kenyan security forces killed all four gunmen. Waiting for any help from anywhere. Reporter: In the aftermath 147 were killed. Another 100 injured. The 500 survivors are traumatized beyond words. Now this man is Kenya's most wanted. Mohammed mohamud, the Al shabaab terrorist believed to be the mastermind of the horror, just last week universities in Kenya were warned they were targets for the terror group which was behind the 2013 Westgate mall terror attack that left 67 dead. Al shabaab has already threatened the mall of America in a recent video and recruited some 20 somalian-americans to join them including the first known American suicide bomber. What is astonishing in all these attacks, how few gunmen it took apparently just those four and this one to take so many lives and that is what concerns authorities in the U.S., as well. Such a chilling methodical way, thanks very much. We'll turn to that nuclear

This transcript has been automatically generated and may not be 100% accurate.

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