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Al Shabaab gunmen killed 148 people, wounded many others
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Gunmen sought out Christians to kill, take hostage
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University attack the biggest in Kenya since 1998 (Adds comment by churchgoer)
By Edith Honan
GARISSA, Kenya, April 5 (Reuters) - Kenyan churches used armed guards to protect their Easter congregations on Sunday, days after gunmen from the Islamist al Shabaab group killed nearly 150 people at a Kenyan university.