suspected al shabaab militants killed 147 people. almost all students. the gunmen stormed a christian prayer service before shooting their way across campus. the militanting spared only muslims during the four-hour siege. there are also chilling stories of survival, including a woman who smeared her dead friend's planned parenthood on her body to fool the gunmen. she tells her story todavid mckenzie. >> reporter: entering the badlands of northeast kenya, the poorest border of somalia just 90 miles away. it's a constant threat to kenya's security. kenyan special forces, little to do now except look over the grim task of loading the dead. just discharged from hospital, helen titis said she hid in a wardrobe when the shooting started, but the terrorists found her. >> shoot them, shoot them. they give us a lecture.