Counter-terrorism police arrest 12 people in connection with alleged “serious threats” relating to an Islamic event at a country mansion in Suffolk, according to reports. The operation involves multiple arrests and detentions. Three men are arrested on suspicion of conspiracy to commit murder. In addition, eight other people are detained under the Terrorism Act 2000 while inquiries continue. A woman is arrested on suspicion of assisting an offender. The reports describe the suspected threats as being directed at an Islamic event at the Suffolk location. Police have not been reported as confirming specific details of the alleged plot in the provided accounts. The arrests and detentions are presented as part of a counter-terrorism investigation, with further investigative steps expected as authorities assess information gathered during the operation and determine potential implications for public safety.