KAMPALA( Reuters)-Uganda said on Monday it was investigating whether fighters allied with the militant group Islamic State( IS) had carried out a bombing in Kampala on Saturday night that killed one person and injured three others. The bomb, set off in a restaurant in a suburb on the northern outskirts of the capital, killing a 20-year-old waitress, was an improvised device made from nails and other metal fragments, according to the police. Islamic state claimed responsibility for the blast in a