Police have raided a building in East Street, Grantham, today and carried out searches.
Officers have been at the former ATS premises near the top of East Street since this morning.
A woman who lives nearby said: “They have been there most of the morning. I went out to the shop and when I came back they were taking away a car. Others were inside where there were some kind of big silver vents.”
Police were searching a car in the building this afternoon at about 2.30pm.
A police spokesman confirmed this afternoon there was a warrant to search the premises, but could not give any more details as the operation was ongoing.