BBC
Counter-terrorism officers making an arrest
Police person been fixed much clip to question 4 Iranian men implicit an alleged panic crippled successful the UK.
The men were arrested connected 3 May connected suspicion of mentation of a violent act, the Metropolitan Police said.
The suspects, detained nether the Terrorism Act, tin beryllium held until 17 May aft the unit obtained warrants to further widen their detention.
A 5th Iranian man, who was detained nether the Police and Criminal Evidence Act, has been released connected bail with conditions.
The 5 men - 2 aged 29, a 40-year-old, a 24-year-old and different aged 46 - connected 3 May - were arrested successful Swindon, westbound London, Stockport, Rochdale and Manchester.
The Met said officers were continuing hunt a fig of addresses successful the Greater Manchester, London and Swindon areas.
Cdr Dominic Murphy, caput of the Met's antagonistic coercion command, said it was a "significant and highly analyzable investigation".
He urged the nationalist not to "speculate oregon stock information" that has not been confirmed by police.
The Met has antecedently said it believes "a circumstantial premises" was the people of the suspected plot.
The BBC understands the alleged people was the Israeli embassy successful London, arsenic archetypal reported by the Times. Police person not yet confirmed the embassy was the suspected target, citing operational reasons.
Three different Iranian men - aged 39, 44 and 55 - were arrested connected the aforesaid time successful London successful narration to a abstracted counter-terrorism investigation.
They were arrested nether conception 27 of the National Security Act, which covers offences deemed a menace to nationalist security.
On Friday, constabulary said a fourth man, 31, had been arrested successful north-west London arsenic portion of the aforesaid investigation.
Cdr Murphy has said constabulary are not linking the 2 investigations.
Speaking successful the Commons connected Tuesday, Home Office curate Dan Jarvis described the 2 abstracted investigations arsenic "some of the largest counter-state threats and counter-terrorism actions that we person seen successful caller times".