Mo Farah had to be taken to hospital after collapsing at the finish line after the New York Half Marathon.
The double Olympic champion was well enough to appear at a press conference a few hours after the race, telling reporters: "I feel good. I just tried so hard in the race. It's not a big deal."
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Police say it is "too early" to know if the body is that of journalist Kim Wall, who is believed to have died on board an amateur submarine.
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