Authorities said Friday that cables supporting a pedestrian bridge under construction in Florida were being tightened following a "stress test" when the 950-ton concrete span collapsed over traffic, killing at least six people, injuring 10 others and flattening an untold number of cars. 

A man who shot himself in the head Saturday outside the north fence lining the White House is dead, D.C. police and the U.S. Secret Service confirmed.