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World champion sprinter Richard Browne has pulled out of competing at the Rio Paralympics after suffering a hamstring injury in the build-up to the US trials.

The American is the world record holder for both the 100m and 200m in the T44 category and among the biggest names in the sport.

National team-mate Jarryd Wallace calls the news a "heartbreak for the US Paralympic team", and explains the difficulty Browne faced in making the decision.

(Photo; Richard Browne setting world record at Doha 2015, Credit; Getty images)