The group behind Thursday's massacre in Kenya is threatening more violence.
In a statement, al-Shabaab said it would make the country's cities "run red with blood".
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Neighbouring Uganda is also on high alert amid reports of a planned terrorist attack against the Uganda Christian University, near the capital Kampala.
Kenyan police are questioning 5 people following Thursday's attack on Garissa University, which left 148 people dead.
People of all religions have been protesting in Garrissa against Al Shabab.
