The arrests took place in London, Swindon, and the Manchester area. According to information from the British police, it concerns "a plot aimed at a specific facility".
The men are between 29 and 46 years old. The nationality of the fifth man has not yet been established.
The investigation is in an early stage, and the police are investigating whether there is further risk to the general public.
The British police have also arrested three more men from Iran in another police investigation related to terrorism, without mentioning further details. The men are in their 40s and 50s and were arrested in London on Saturday, reports BBC. According to the police, the two cases have no connection to each other.
