2010 – Sergei Skripal, a former Russian military intelligence officer imprisoned for spying for Britain, is released and transferred to the United Kingdom as part of an exchange with Russian agents trapped in the United States. It is established in Salisbury.
March 3, 2018 – Yulia Skripal arrives at Heathrow airport from Russia to visit her father in England.
March 4, 9.15 a.m. – The burgundy BMW of Sergei Skripal is seen in the suburbs of Salisbury, near a cemetery, where his wife and son are commemorated.
March 4, 1.30 p.m. – The BMW is seen driving towards the center of Salisbury.
March 4, 1.40 p.m. – The BMW is parked on a lot in downtown Salisbury.
A police officer stands guard outside the Zizzi restaurant where Sergei and Yulia had lunch before collapsing in a nearby park
March 4, afternoon – Sergei and Yulia Skripal visit the Bishops Mill pub.
March 4, 2.20 p.m. to 3.35 p.m. – Sergei and Yulia Skripal have lunch at the Zizzi restaurant.
March 4, 4.15 p.m. – Emergency services are called by a bystander concerned about a man and a woman in the downtown area of Salisbury.
The officers find the Skripals unconscious in a bank. They are taken to the hospital in the Salisbury district, where they remain in critical condition.
March 5, morning – Police say that two people in Salisbury are being treated for suspected exposure to an unknown substance.
Detective Sergeant Nick Bailey was one of the first police officers on the scene and he himself was hospitalized
March 5, afternoon – The Wiltshire police, together with Public Health England, declare an "important incident"
7 of March – The police announce that the Skripals were probably poisoned with a nerve agent in a targeted assassination attempt.
They reveal that a police officer who responded to the incident is in serious condition in a hospital.
March 8 – Home Secretary Amber Rudd describes the use of a nerve agent in the UK as a "blatant and reckless act" of attempted murder
March 9 – Around 180 soldiers trained in chemical warfare and decontamination are deployed in Salisbury to help with the police investigation.
Russian Foreign Minister Sergey Lavrov said Moscow may be willing to help with the investigation, but expresses resentment at suggestions that the Kremlin was behind the attack.
March 11th – Public health officials tell people who visited the Zizzi restaurant or the Bishops Mill pub in Salisbury on the day of the attack or the day after they washed their clothes as a precaution.
March 12, morning– Prime Minister Theresa May tells the House of Commons that the Skripals were poisoned with Novichok, a military-grade nerve agent developed by the Soviet Union during the Cold War.
March 12, afternoon – Public Health England asks everyone who visited downtown Salisbury on the day of the attack to wash all their clothes and belongings.
Officers dressed in chemical protective suits secure the forensic shop on the bench where Sergei and Yulia became ill
March 14 – The prime minister announces the expulsion of 23 alleged Russian spies from the United Kingdom embassy in the country.
March 22 – Nick Bailey, the police officer injured in the attack, is released from the hospital.
March 26 – The United States and 22 other countries joined Great Britain to expel dozens of Russian spies from capitals around the world.
March 29 – Doctors say that Yulia Skripal is "rapidly improving" in the hospital.
April 3 – The head of the defense laboratory at Porton Down said he could not verify the "precise source" of the nerve agent.
April 5, morning – Yulia Skripal's cousin, Viktoria, says she has received a call from Yulia saying she plans to leave the hospital soon.
Dawn Sturgess died in the hospital on July 8
April 5, afternoon – A statement on behalf of Yulia is released by the Metropolitan Police, in which she says that her force is "growing daily" and that "dad is fine".
April 9th – Ms. Skripal is discharged from the hospital and transferred to a safe place.
May 18 – Sergei Skripal is discharged from the hospital 11 weeks after he was poisoned.
June 30th – Dawn Sturgess and Charlie Rowley get sick on a property in Amesbury, which is eight miles from Salisbury, and they are rushed to the hospital.
July 4th – The police declares an important incident after Ms. Sturgess and Mr. Rowley are exposed to an "unknown substance", which was later revealed as Novichok.
July 5th – Sajid Javid demands an explanation about the two poisonings, as he accuses the Russian state of using Britain as a "poison dump".
July 8 – Mother-of-three Dawn Sturgess, 44, dies in hospital due to contacting Novichok.
July 10th – Mr. Rowley regains consciousness in the hospital, and later tells his brother that Dawn had sprayed the Novichok on his wrists.
July 19 – It is believed that the police identified the perpetrators of the attack.
20th of August – Charlie Rowley is taken to the hospital when he begins to lose his site, but doctors can not confirm if it has anything to do with the poisoning.
26 of August – Charlie Rowley entered the intensive care unit with meningitis
August 28 – The police call the "super recognitions" to arrest the poisoners
4th of September – Charlie Rowley's brother says he has "lost all hope" and does not have much time to live.
Independent investigators, the Organization for the Prohibition of Chemical Weapons, confirm that the toxic chemical that killed Ms. Sturgess was the same nerve agent that poisoned the Skripals.
September 5 – Scotland Yard and CPS announce sufficient evidence to accuse Russian citizens Alexander Petrov and Ruslan Boshirov of conspiracy to murder a nervous agent of Salisbury.