A boy watches as Kenyan authorities demolish a building in the Mathare neighbourhood of Nairobi, Kenya, May 17, 2016. Kenya's authorities tore down the badly built residential block in the poor Nairobi district on Tuesday, one of more than 250 shoddy buildings that could now face demolition after a six-story structure collapsed this month killing 51 people. REUTERS/Goran Tomasevic SEARCH "MATHARE DEMOLITION" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES