Bomb disposal teams are in Luton after a suspicious device was found in a car.
Dunstable Road has been closed between Nadeem Plaza and Francis Street and Bedfordshire police and an EOD (explosive ordnance disposal) team are there.
One man was arrested at the scene and a second man was arrested shortly afterward in Brook Street.
Police then also closed Brook Street but they say this is just a precaution.
Police are advised to avoid both areas and find alternative routes to travel.