A man has been charged with three counts of arson with intent to endanger life following attacks on property linked to the Prime Minister, the Metropolitan Police has said. Ukrainian Roman Lavrynovych, 21, was arrested at an address in Sydenham, south-east London, in the early hours of Tuesday.

He is due to appear at Westminster Magistrates’ Court on Friday. Counter-terrorism officers have been working “at pace” to establish the cause of the fires and “any potential motivation”, Scotland Yard previously said.

Sir Keir told the House of Commons on Wednesday that the incident was “an attack on all of us, on democracy and the values that we stand for”.

Conservative leader Kemi Badenoch condemned the attacks as “completely unacceptable” as the two party leaders began their weekly clash at Prime Minister’s Questions.

“I think I speak for the whole house when I say that this wasn’t just an attack on him, but on all of us and on our democracy,” the Tory leader added.

Sir Keir thanked the Opposition leader for contacting him “pretty well straight away” to lend her support.

The Prime Minister added: “I really do appreciate that, and she’s absolutely right that this is an attack on all of us, on democracy and the values that we stand for.”

The 21-year-old suspect remained in custody at a London police station as of Tuesday evening.

Cdr Dominic Murphy, head of the Met’s counter-terrorism command, acknowledged the probe may cause concern to MPs.

“I would encourage any MP who is concerned about their own safety to get in touch with their dedicated local Operation Bridger officer, who can provide further advice and support,” he said in a statement on Tuesday.

On Monday, a police cordon and officers, as well as investigators from London Fire Brigade (LFB), could be seen outside the Kentish Town property where the Prime Minister used to live.

The Met said residents could expect an increased police presence in the coming days.

Neighbours described hearing a loud bang and said police officers were looking for a projectile.

Police were alerted by the LFB to reports of a fire at the residential address at 1.35am.

Damage was caused to the property’s entrance but nobody was hurt.

In the early hours of Sunday, firefighters dealt with a small fire at the front door of a house converted into flats in nearby Islington, which is also linked to Sir Keir.

One person was assisted to safety via an internal staircase by crews wearing breathing apparatus, the LFB said.

The car fire broke out in the early hours of Thursday, May 8, in the same street as the Kentish Town property.