Police : Blasts were caused by grenades , Two arrested . two explosions killed 10 people in central UK , officials said . Kenyan President expressed his sympathy to those affected . CNN 's Faith Karimi and Lindsay Isaac also contributed to this report . Attacks come after Nairobi , Australia , Australia issue travel alerts .
Police : Blasts were caused by grenades , Two arrested . two explosions killed 10 people in central UK , officials said . Kenyan President expressed his sympathy to those affected . Attacks come after Nairobi , Australia , Australia issue travel alerts .