Five houses were raided by police as part of an inquiry into a gang suspected of promoting extremist views and radicalising vulnerable people.
The properties were all in Stoke-on-Trent, including three in Cobridge, one in the High Lane area of Burslem and one in Tunstall, Staffordshire Police said.
A spokesman said the raids were part of an "ongoing investigation into the activities of a small group of people suspected of being involved in promoting violent extremist views and radicalising vulnerable community members".
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He added: "They are being conducted under the Terrorism Act and have been prompted by concerns about the activities of a small number of people in the local community."
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