Twelve men have been arrested during a major anti-terrorist operation, West Midlands Police said.
The men - five from Cardiff, four from Stoke-on-Trent and three from London - were detained on suspicion of the commission, preparation or instigation of an act of terrorism in the UK.
The suspects, aged between 17 and 28, were detained by unarmed officers about 0500 GMT.
Officers are now conducting searches at the men's homes and other addresses.
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