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"You have to know that it exists before you can protect yourself," said Zane's dad Kye Gbangbola, who was left paralysed after the gas poisoning.

Zane's parents, Kye Gbangbola and Nicole Lawler, say their son was killed by toxic hydrogen cyanide gas from a former waste dump.

In the men’s event, Olympic and world silver medallist Kye Whyte is returning from a back injury of his own.

If Beth Shriever and Kye Whyte have recovered from pre-Games injuries and are still in the running, they will have to negotiate the semi-finals before the gold-medal races from 20:35.

Also included in the British team is Kye Whyte, who won his nation's first Olympic BMX racing medal with silver in the men's event - moments before Shreiver's gold in Tokyo.