Athletics: Bolt secures third sprint sweep as Jamaica win relay

USA's Trayvon Bromell (R) shakes hands with Jamaica's Usain Bolt (C) as Nesta Carter (L) looks on at the end of the final of the men's 4x100 metres relay athletics event at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing on August 29, 2015. The US team was disqualified the Jaican team won gold. AFP PHOTO

Usain Bolt secured a sweep of the sprint golds at a world championships for the third time on Saturday when, aided by a U.S. disqualification, he anchored Jamaica to the 4x100 metres relay title.

The 29-year-old, who had already won the 100 and 200 metres events at the Bird's Nest Stadium, stormed across the line in 37.36 seconds to give his country a fourth straight world title in the event.