Police who are questioning a man under the Terrorism Act have searched a property in North Yorkshire as part of their operation.
The 31-year-old man was arrested in Dundee on Saturday over potentially explosive materials found at a house in Goole, East Yorkshire, last Wednesday.
Officers have searched a house in Selby and seized documents.
Meanwhile a second man who was arrested last Wednesday, also 31 and from Goole, has been released without charge.
A spokeswoman for the police Counter Terrorism Unit (CTU) in Leeds said inquiries were ongoing.
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