Sandy Murray, of Police Scotland, was was giving evidence at the trial of a bus driver who denies killing Ryan Baird by dangerous driving.
The arrests come weeks after a much-publicised series of appeals to mark the 30th anniversary of the 18-year-old's death.
Kerrie brings you Sunday's pollen count
Kerrie brings you Sunday night's forecast
High pressure rebuilds from Monday. Any cloud and rain move westwards. Some low cloud for eastern coasts. Very warm inland
A major rescue operation was launched after five people were spotted stranded on lilos in the Solway Firth.
Kerrie brings you Saturday's pollen count
Kerrie brings you Saturday night's forecast
A little more cloud from the NW into Sunday but High Pressure stays nearby