West Yorkshire Counter Terrorism officers carried out raids on three properties in Keighley last night.
The raids, which were carried out under the anti-terrorism act were part of an operation in co-operation with Lancashire Police.
Firearms officers were not involved in the Keighley operation.
More detailed searches are due to be carried out today.
Prior to the searches taking place a meeting was held between police and community leaders, and representatives for the community accompanied police on the raids.
The raids in Lancashire led to two arrests, initially believed to be related to last weekend's terror attacks in London and Glasgow but police have since confirmed that premises searched in Blackburn appear to have been used to cultivate cannabis. Two men arrested in Blackburn are now being held on suspicion of offences under the Drugs Act and not under terrorism legislation.
A police spokesman said: "We realise these are sensitive times and on this occasion a member of the public who had their suspicons aroused rightly contacted police."
Police both in West Yorkshire and Blackburn are appealing for people to remain vigilant and if they suspect any potentially suspicious activity to contact their local police or the Anti Terrorist Hotline on O8OO 789321.
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