Police were today continuing to question two men arrested near Heathrow Airport under the Terrorism Act 2000.
The men were detained in the Hounslow area of west London by anti-terrorist police yesterday afternoon.
The incident is not believed to be connected to the mass security operation at Heathrow and was thought to be a precautionary measure.
They were believed to have been stopped in a car during routine police checks which are part of the heightened alert around Heathrow.
They remained in custody at a west London Police Station.
The two men were not believed to be linked to any plot to attack the airport.