arrows

The 18-year-old – leading the league and seeking a record fifth nightly win of the year - opted for heavier darts, up three grams to 26g, in a bid to keep his arrows on track.

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"The majority of our members use bows and arrows, but crossbows are used, predominantly by older or disabled participants who may be unable to use a traditional bow and arrow," he said.

Ms Sinsheimer, 40, said some of the runners quickly realised the arrows had been tampered with, but others were unfamiliar with the park.

A sign on the wall marks the "Toxic Release Assembly Point," another sign with arrows is marked the "Criticality Run."