Police have appealed for information regarding the vehicle which was used in a terrorist attack at Glasgow Airport.
They want to hear from anyone with information about the green Jeep Cherokee, registration number L808 RDT.
Assistant Chief Constable John Malcolm, of Strathclyde Police, said he was keen to know where the car had been in the last few weeks and days.
He also appealed for any photos and videos taken by members of the public during and before the attack.
At a news conference in Glasgow, ACC Malcolm said the suspect being treated in hospital for severe burns was believed to have been the driver of the car.
He remains in a critical condition and is under armed police guard at the Royal Alexandra Hospital, Paisley.
Police have confirmed that a controlled explosion was carried out on a vehicle at the hospital.
It has also been revealed that the second suspect being held at Govan police station is aged 27.
Police have said there were only two people in the Jeep when it was driven at the airport terminal building on Saturday.
KEY EVENTS IN TERROR PROBE
Two men arrested after Jeep rams the Glasgow Airport terminal building
Strathclyde officers search houses in Renfrewshire, including one in Houston
Army bomb disposal officers carry out controlled explosion at Royal Alexandra Hospital in Paisley
Two people, a 26-year-old man and 27-year-old woman, arrested on the M6 in Cheshire
Merseyside Police arrest 26-year-old man and search addresses in the Liverpool area
Officers search addresses in Newcastle-under-Lyme
The vehicle has now been removed and further forensic tests will be carried out.
Anyone with information about the Jeep should contact Strathclyde Police's incident room on 0800 056 0944.
ACC Malcolm said searches were continuing at addresses in the Renfrewshire area.
Police carried out searches of a number of homes on Neuk Crescent, in Houston.
A Royal Marine, whose parents live in Neuk Crescent, supplied BBC Scotland with stills and video footage of the police operation.
The pictures were taken through blinds and show armed officers surrounding the house across the road at about 0430 BST on Sunday.
He said the two men who lived in the house moved in several months ago and that other people in the street described them as "very secretive".
They were "young guys", one of whom had an English accent.
Three different cars had been seen at the house - a silver Peugeot, a light blue Mercedes and a silver Vauxhall Astra.
He added that there had been an "excellent" response from the public with about 100 calls an hour being received.
"I am satisfied that this investigation is progressing dynamically at pace," he said.
Earlier, Scotland's First Minister Alex Salmond vowed that the country would not be beaten by terrorists, as Glasgow Airport fully reopened.
He praised the efforts of staff for getting the building up and running just a day after the attack.
Mr Salmond said it appeared that those involved in the incident had not been in Scotland "for any length of time".
Speaking from Glasgow Airport, Mr Salmond said measures had been taken to ensure public safety.
"It's the case that, as far as we can tell at the present moment, that the people involved in the incident had not been in Scotland for any length of time.
"We have a hugely important minority community in Scotland," he added.
"They do tremendous things for Scottish life, for the Scottish economy. They're very much valued as part of Scottish society."
The first minister said he had been speaking to stranded passengers at the airport, adding: "People have been waiting for some considerable time. People have got great patience and understanding.
"Scotland will be back to work and the passengers who are waiting to go on holiday - they'll be on holiday."
The airport was fully opened at 1500 BST on Sunday, almost 24 hours after the car was driven into the terminal building.
Strathclyde Police have linked the attack to the discovery of two car bombs in London's West End on Friday.
As a result of both incidents, the UK has moved to its highest level of terror alert - critical.
A further two people have been arrested in Cheshire and another in Liverpool.
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