Olympic marathon champion Tiki Gelana collides with wheelchair athlete Josh Cassidy during the 2013 London Marathon.

Gelana cut across the wheelchair athletes to get to her water bottle nine miles (15km) into the race, with Canadian Cassidy unable to avoid her.

The Ethiopian athlete was able to pick herself up and rejoin the front group of the race.

Afterwards, Cassidy called for a change in where water bottle stations are placed during the marathon.

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