British police have arrested seven people suspected of terrorism offences.
Five were arrested in Wales on Thursday and two were arrested in London.
The arrests follow a recent uptick in terror arrests as British police cope with an increasing number of Britons trying to join extremist Islamic State fighters in Syria.
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There are concerns that some who have returned are plotting attacks in Britain.
Welsh police said the five were arrested because of suspected support for banned organisations.
A 33-year-old man was arrested in London on suspicion of involvement in terrorism and a 40-year-old man was arrested on suspicion of conspiracy to pass fraudulent documents.
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Police say the two London arrests are linked to the earlier arrests of five other terror suspects still being questioned.