A series of morning raids has seen a total of six people arrested on suspicion of terror offences across the country.
Police said that four men from Derby between the ages of 22 to 36, a 32-year-old woman from London and a 27-year-old man from Burton upon Trent were arrested on suspicion of engaging in the preparation of a terrorist act. They are currently in police custody.
The investigation into their conduct is being implemented by Derbyshire, Staffordshire, and the Metropolitan Police, and six properities in Burton, London and Derby are being searched as part of it.
The police have said local officers will be patrolling to speak to anyone with concerns, while forensic teams have been spotted on Leopold Street in Derby, having closed the road to traffic.