CNN 's Faith Karimi and Lindsay Isaac also contributed to this report . Kenya : Blasts were caused by grenades , suspects arrested . The blast killed 10 people in central Nairobi , officials said . Kenyan President expressed his sympathy to those killed . Attacks continue after Canada , Australia , UK issue terrorist alerts .
Kenya : Blasts were caused by grenades , suspects arrested . The blast killed 10 people in central Nairobi , officials said . Kenyan President expressed his sympathy to those killed . Attacks continue after Canada , Australia , UK issue terrorist alerts .