Seven Iranians were among eight men arrested in two investigations. Some of the detained were accused of preparing a terrorist attack on an unnamed site.

British counterterrorism officers have arrested several Iranian men over an alleged plot to attack an unspecified target in London.

Four men are continuing to be questioned by police over an alleged terror plot in the UK. The men, who are Iranian nationals, are being held over an alleged plan to target "a specific premises", the Metropolitan Police said.