2010 - Sergei Skripal, a former Russian military intelligence officer jailed for spying for Britain, is released and flown to the UK as part of a swap with Russian agents caught in the United States. He settles in Salisbury.
2018
March 3 - Yulia Skripal arrives at Heathrow Airport from Russia to visit her father in England.
March 4, 9.15am - Sergei Skripal's burgundy BMW is seen in suburban Salisbury, near a cemetery, where his wife and son are commemorated.
March 4, 1.30pm - The BMW is seen driving toward central Salisbury.
March 4, 1.40pm - The BMW is parked at a lot in central Salisbury.
March 4, afternoon - Sergei and Yulia Skripal visit the Bishops Mill pub.
March 4, 2.20pm to 3.35pm - Sergei and Yulia Skripal have lunch at the Zizzi restaurant.
March 4, 4.15pm - Emergency services are called by a passer-by concerned about a man and a woman in Salisbury city centre.
Officers find the Skripals unconscious on a bench. They are taken to Salisbury District Hospital, where they remain in critical condition.
GRU agents Anatoly Chepiga and Alexander Mishkin are shown smiling in Salisbury on the day they unleashed the novichok chemical weapon
March 5, morning - Police say two people in Salisbury are being treated for suspected exposure to an unknown substance.
March 5, afternoon - Wiltshire Police, along with Public Health England, declare a 'major incident'
March 7 - Police announce that the Skripals were likely poisoned with a nerve agent in a targeted murder attempt.
They disclose 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 on UK soil was a 'brazen and reckless act' of attempted murder
March 9 - About 180 troops trained in chemical warfare and decontamination are deployed to Salisbury to help with the police investigation.
Russian Foreign Minister Sergey Lavrov says Moscow might be willing to assist with the investigation but expresses resentment at suggestions the Kremlin was behind the attack.
March 11 - Public health officials tell people who visited the Zizzi restaurant or Bishops Mill pub in Salisbury on the day of the attack or the next day to wash 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 ask everyone who visited Salisbury town centre on the day of the attack to wash all of their clothes and belongings.
