The results of the men 's 800 m T54 race on Monday 17 July were nullified .
The race rescheduled to Friday 21 July after three competitors crashed at the 600 - metre mark .
The results of the men 's 800 m T54 race on Monday 17 July were nullified and the race rescheduled to Friday 21 July after three competitors crashed at the 600 - metre mark .