Labour leader Ed Miliband has urged Scotland to remain in the union, saying in a tweet that "together we can keep achieving social justice."
In 100 Days, Scotland has an historic choice. Together we created the NHS & the minimum wage. Together we can keep achieving social justice.
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The man, who was in his 30s, has not been identified, while several other people are believed to have suffered serious injuries.
The Olympian was one of several sports stars who opened up to the prince during an event for his mental health charity Heads Together.
There will be sunny spells, with temperatures peaking at 23 Celsius (73F). However, Northern Ireland will experience frequent showers.