Grieve said: 'Terrorists need transport - for themselves, and for their equipment and explosives. Despite recent seizures, we believe we are entering some dangerous months ahead and we urge everyone to be even more alert.
'It is communities that defeat terrorism, and I am calling on the communities involved in the motor trade to help us by providing vital information about terrorist crime. We need to hear from anyone who has sold, or worked on, a motor vehicle in suspicious circumstances.'
He identified a number of tell-tale signs which could arouse suspicion including:
Anyone with information should telephone free on 0800 789 321.