Authorities work to prevent another deadly disaster after 51 die in collapse

Kenya's authorities tore down a badly built residential block in a 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.

Nearby, residents of another condemned block in Mathare scrambled to wrap up utensils and other items in bed sheets and stuffed plastic bags with clothes as workers ripped out door and window frames to prepare for machinery to destroy the structure.