(London Metropolitan Police)

Britain is charging two Russian men over the poisoning of the former Russian spy Sergei Skripal in Salisbury, England, early 2018.

Prosecutors said they had sufficient evidence to charge two men, identified as Alexander Petrov and Ruslan Boshirov, with attempted murder over the attack.


Prime Minister Theresa May on Sept. 5, 2018, added that the two men were officers from the Russian intelligence services, also known as the GRU.

"Security and intelligence agencies have carried out their own investigations," May told Parliament on Sept. 5, 2018. "I can today tell the House ... that the government has concluded that the two individuals named are officers from the Russian intelligence services."

Surveillance footage shows the two suspects leaving London for Moscow at Heathrow Airport hours after Skripal collapsed on March 4, 2018.

(London Metropolitan Police)

Skripal previously worked as a military-intelligence colonel at the GRU but was recruited by British spies to pass on state secrets. He was later arrested and imprisoned but was pardoned and released to the UK by the Russian government in 2010.

May said authorization for the attack "almost certainly" came from the senior levels of the Russian government. She added that she would push for more European Union sanctions against Russia over the poisoning.

The two men are now believed to be in Russia. Authorities plan to formally request via Interpol that the Russian police arrest them.

The British police also released a detailed description of the suspects' whereabouts in the run-up to the attack as well as a series of images taken from surveillance footage of the two men in London and Salisbury.

Surveillance camera footage of Petrov and Boshirov in Salisbury, England, on the day the Skripals were poisoned.

(London Metropolitan Police)

Neil Basu, a senior officer with the London Metropolitan Police's counterterrorism unit, said that the two men most likely traveled under aliases and that Petrov and Boshirov might not be their real names. Both suspects are estimated to be 40 years old.

Skripal and his daughter, Yulia, collapsed in Salisbury in March 2018 after being exposed to Novichok, a military-grade nerve agent that was developed by the Soviet Union during the Cold War. The poison had been applied on Skripal's front door, police said.

Both father and daughter were eventually discharged from the hospital.

Poison in a perfume bottle

A British couple in Amesbury, a town near Salisbury, was exposed to the poison after coming into contact with a perfume bottle containing it in late June 2018.

It resulted in the death of Dawn Sturgess, who fell ill after applying the substance to her wrists. The other victim, Charlie Rowley, was discharged from a hospital about two weeks after collapsing.

Rowley told the police he found a box he thought contained perfume in a charity bin in late June 2018, more than three months after the Skripals collapsed.

The box contained a bottle, purported to be from the designer brand Nina Ricci, and an applicator, and Rowley got some of the poison on himself when he tried to put the two parts together at home.

Tests run by the Ministry of Defense found that the bottle contained a "significant amount" of Novichok, the police said.

"The manner in which the bottle was modified leaves no doubt it was a cover for smuggling the weapon into the country, and for the delivery method for the attack against the Skripals' front door," May said.

The police on Sept. 4, 2018, said they thought the two incidents were linked.

Authorities said they believed the couple were not deliberately targeted but "became victims as a result of the recklessness in which such a toxic nerve agent was disposed of."

Britain's diplomatic relationship with Russia suffered after London accused Moscow of being behind the Skripals' poisoning. The Kremlin has repeatedly denied knowing about the attack.

Surveillance camera footage of Petrov and Boshirov at a Salisbury train station the day before Skripal collapsed.

(London Metropolitan Police)

The suspects' whereabouts

The police believe the two suspects were in the UK for just three days to carry out the attack. On Sept. 5, 2018, the force outlined the two suspects' whereabouts in the run-up to the Skripals' poisoning in March 2018:

  • March 2, 3 p.m.: The suspects arrive at London's Gatwick Airport after flying from Moscow on Aeroflot Flight SU2588.
  • 5 p.m. (approx): They travel by train into Victoria station, central London. They then travel on London public transport.
  • 6 p.m. to 7 p.m.: They spend about an hour in Waterloo before going on to the City Stay Hotel in Bow Road, east London, where they stay for the next two nights.
  • March 3, 11:45 a.m.: They arrive at Waterloo station from their hotel, where they take a train to Salisbury, where Skripal lives.
  • 2:25 p.m.: They arrive at Salisbury. The police believe this trip was for a reconnaissance of the area and do not believe they posed a risk to the public at this point.
  • 4:10 p.m.: They leave Salisbury and arrive at their hotel four hours later.
  • March 4, 8:05 a.m.: The two men arrive at Waterloo station again to go to Salisbury.
  • 4:45 p.m.: They return to London from Salisbury.
  • 10:30 p.m.: They leave London for Moscow from Heathrow Airport on Aeroflot Flight SU2585.

Skripal and his daughter collapsed on a bench at a Salisbury shopping center at about 4:15 p.m. on March 4, 2018.

This article originally appeared on Business Insider. Follow @BusinessInsider on Twitter.