A fourth man has been arrested as part of an investigation into a series of fires in north London at properties and a car linked to Prime Minister Sir Keir Starmer.
Police say the 48-year-old man was arrested on Monday at London’s Stansted Airport.
He was initially stopped by officers under schedule 7 of the Terrorism Act, 2000, before being arrested on suspicion of conspiracy to commit arson with intent to endanger life, the Metropolitan Police said.
Three men have already been charged in connection with the fires.
Ukrainians Petro Pochynok, 34, and Roman Lavrynovych, 21, and Ukrainian-born Romanian national Stanislav Carpiuc, 26, are all due to appear at the Old Bailey on Friday.
Aspiring model Lavrynovych, of Sydenham, south-east London, is accused of three counts of arson with intent to endanger life.
Pochynok, of Holloway Road in Islington, north London, who describes himself online as a fashion entrepreneur, and would-be model Carpiuc, of Chadwell Heath, east London, are charged with conspiring to commit arson with intent to endanger life.
Two of the fires took place in Kentish Town, north London – one in the early hours of May 12 at the home where Sir Keir lived before he became Prime Minister and moved into Downing Street.
His former Toyota Rav4 car was set alight in the same street four days earlier on May 8.
The other fire took place on May 11 at the front door of a house converted into flats in Islington.
Sarah Przybylska, for the prosecution, had previously told the court “at this stage the alleged offending is unexplained”.
In the House of Commons last month, Sir Keir called the incidents “an attack on all of us, on democracy and the values that we stand for”.
Conservative leader Kemi Badenoch condemned them as “completely unacceptable”.
