VIDEO: Latest from scene of Chesterfield counter terrorism operation
This is the scene on King Street North in Chesterfield, where police have been carrying out a counter terrorism operation.
Officers from the Counter Terrorism Policing North East have been working with MI5 on a pre-planned operation, which has seen four people being arrested.
One of those arrested earlier this morning was a 31-year-old man from Chesterfield, and officers have been searching a property in Chesterfield as part of the investigation.