Police are appealing for information following numerous reports of dangerous driving in the Highlands last weekend.
Various reports of dangerous driving were made in relation to four sports cars seen on the A835 on Saturday.
They are known to have been on the road between Ullapool and Contin some time between 2.30pm and 3.25pm.
The vehicles involved are believed to be a blue BMW M6, an orange Nissan GTR and another two unidentified sports cars, black and blue in colour.
It is believed that they are connected to group of cars seen travelling at excessive speed on the A74 in Dumfries and Galloway on Sunday afternoon.
Constable Alasdair Mackay, of the Road Policing Unit in Dingwall, said: “We have various reports of the inappropriate speed and dangerous manner in which these cars were being driven.
“It is suspected they were travelling in convoy throughout the north of Scotland.
“We are asking anyone who believes they may have seen these vehicles or has dashcam footage of them to get in touch. You can call police on 101 to pass on any information.”