More than 350 motorcyclists are taking part in a mass ride in memory of former British Superbikes Champion Steve Hislop.
Hislop was killed in a helicopter crash in 2003. This year's annual Steve 'Hizzy' Hislop Memorial Run will see the bikers travel 130 miles through the Scottish Borders, before finishing at Hislop's hometown of Denholm.
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Sandy Murray, of Police Scotland, was was giving evidence at the trial of a bus driver who denies killing Ryan Baird by dangerous driving.
34-year-old Christopher Peck was involved in a head-on crash with a drunk driver. His funeral has taken place in his hometown, Workington.
The arrests come weeks after a much-publicised series of appeals to mark the 30th anniversary of the 18-year-old's death.