Russian Novichok suspects Alexander Petrov and Ruslan Boshirov: Everything we know so far
Police believe the pair were travelling under aliases and returned to Russia on the same day as the attack on the Skripals
Two Russians have been named as suspects in relation to the Salisbury poisoning of former spy Sergei Skripal and his daughter Yulia.
But what do we know about Alexander Petrov and Ruslan Boshirov who could be charged with numerous offences including conspiracy to murder?
Other crimes they could also be charged with include attempted murder, causing grievous bodily harm with intent and use and possession of Novichok.
They are also wanted in connection with the events in Amesbury where Dawn Sturgess and Charlie Rowley fell ill after coming in contact with Novichok from a perfume bottle.
Ms Sturgess died a week after coming being contaminated with the deadly nerve agent.
Here's everything we know about the two key suspects so far.
Prime Minister Theresa May told the commons today that the two suspects are officers Russia's military intelligence agency.
MPs gasped in the House of Commons as the Prime Minister revealed British intelligence agencies believe the two Russian Nationals named by the Metropolitan Police this morning were officers of the GRU.
Police and prosecutors said there is sufficient evidence to charge Alexander Petrov and Ruslan Boshirov with conspiring to murder Sergei Skripal and attempting to murder the ex-Russian spy, his daughter Yulia and Wiltshire Police detective sergeant Nick Bailey.
Metropolitan Police Assistant Commissioner Neil Basu said the two suspects are aged around 40 and it is likely they were travelling under aliases. Petrov and Boshirov are not their real names.
Detectives believe the front door of Mr Skripal's Salisbury home was contaminated with the military-grade substance on Sunday March 4.
Mr Basu said CCTV shows the two suspects in the vicinity of the property on that date.
Hours later, the men left the UK on a flight from Heathrow to Moscow - two days after they had arrived at Gatwick.
Mr Basu said: "We have no evidence that they re-entered the UK after that date."
In the second incident, Dawn Sturgess, 44, and her partner Charlie Rowley, 48, were exposed to the same nerve agent used in Salisbury.
Ms Sturgess died in hospital in July, just over a week after the pair fell ill.
Police released an image of a perfume bottle recovered from Mr Rowley's home which contained Novichok.
He said police continue to liaise with the CPS regarding the poisoning of Ms Sturgess and Mr Rowley.
The Russian Foreign Ministry said today that the names of two men British prosecutors have accused of trying to murder former Russian spy Sergei Skripal and his daughter Yulia meant nothing to Moscow, the RIA news agency reported.
Friday March 2 2018
1500: Suspects Alexander Petrov and Ruslan Boshirov arrive at Gatwick Airport, having flown from Moscow on Aeroflot flight SU2588.
1740: The pair arrive at London Victoria station by train from Gatwick.
1800: They then travel on public transport to Waterloo station, and then to the City Stay Hotel in Bow Road, east London, where they stay for two nights.
Saturday March 3
1145: The pair arrive at Waterloo station, having left the hotel, bound for Salisbury. It is believed the two are on a reconnaissance mission.
1425: They arrive in Salisbury by train.
1605: Having spent a short time in the city, Petrov and Boshirov leave Salisbury to begin the return journey.
2005: The pair arrive back in Bow, east London, where they stay at the City Stay Hotel for a second night.
Sunday March 4
0805: The day of the Novichok attack. Petrov and Boshirov use the Underground at Bow to travel to Waterloo, and then on by train to Salisbury.
1148: The pair are caught on CCTV leaving Salisbury railway station.
1158: They are then spotted in Wilton Road in Salisbury, a short distance from Christie Miller Road, Mr Skripal's address. Police say this is moments before the attack.
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https://www.mirror.co.uk/news/uk-news/everything-know-novichok-suspects-alexander-13196693