A 29-year-old man from Stoke-on-Trent has been arrested on suspicion of encouraging terrorism and supporting a proscribed organisation.
This relates to suspected online postings which reference the Islamic State.
The man was detained by officers from the West Midlands Counter Terrorism Unit at his home address this morning (Tuesday, 17 February).
He is currently in custody at a police station in the West Midlands Police area.
The arrest was pre-planned and intelligence led. Action was not taken because there was any immediate risk to public safety.
Anyone with concerns regarding possible extremist material on the Internet can report this anonymously to specialist officers at the national Counter Terrorism Internet Referral Unit. Details can be found at www.direct.gov.uk/reportingonlineterrorism