British police said they had arrested a second person in connection with a series of arson attacks linked to properties owned by Prime Minister Keir Starmer.
Police said in a statement on Saturday that a 26-year-old was arrested at Luton Airport, north of London, on suspicion of conspiracy to commit arson with intent to endanger life.
Police were called to reports of a fire in the early hours of Monday morning at the property in Kentish Town, Camden, north London, the area that Starmer represents in parliament.
The first man, a 21-year-old, was arrested in the early hours of Tuesday in connection with the fire and two further incidents, police said.