US sprint failures prompt review

America will conduct a post-mortem into a disappointing Olympic athletics display that has seen their sprinters eclipsed by their Jamaican rivals.

All four individual sprints were won by Jamaica, with Usain Bolt setting world records in the 100 and 200 metres.

It is the first time since 1976 that the United States have competed in and not won a sprint title at a Games.

USA Track & Field chief Doug Logan said: "We will conduct a comprehensive review of all our programmes."

A miserable Games for a team that billed itself the world's best was highlighted by both the men's and women's 4x100 metres relay teams dropping the baton on Thursday.

"I, like all fans of Team USA, am extremely disappointed with the performance of our relays," Logan continued.

"This assessment will be the way in which we select, train and coach our relays."

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