A fourth person injured during a collision on the M25 on Monday August 23 has now died.
Police were called to the anti-clockwise track of the motorway between Junctions 27 and 26, just after 6.15pm.
Three people were pronounced dead at the scene.
Essex Police are provisionally releasing the identities of the victims, who were all passengers in a minibus at the time of the collision, awaiting formal confirmation from HM Coroner.
Despite the best efforts of emergency services and members of the public who attempted first aid, 31-year-old Abigael Muamba from Edmonton Green; 60-year-old Dexter Augustus from Waltham Forest and 59-year-old Jennifer Smith from Stratford were all pronounced dead at the scene.
Lisa Gardiner, 44, from Walthamstow, has now sadly died of her injuries.
Inspector Mark Fraser, who leads the force’s Serious Collision Investigation Unit, said: “Our thoughts are with the families and loved ones of those who lost their lives in this awful incident.
“My officers are working tirelessly to try and piece up what led to the collision.
“If you saw the three vehicles prior to the collision – a Mondeo, a minibus and a lorry – or have any dash cam of their movements, please contact us.
“Three people have lost their lives and we need to get to the bottom of what happened.”
Two men were arrested that evening: the minibus driver and a lorry driver.
The minibus driver has since been de-arrested following new information.
The lorry driver, a 64-year-old man from Ipswich, was arrested on suspicion of causing death by dangerous driving, causing serious injury by dangerous driving, and driving whilst unfit through drink or drugs.
He has been released under investigation.
Anyone who witnessed the collision, has dash cam footage, or has information on it should submit a report online at https://www.essex.police.uk or use the ‘Live Chat’ button to speak to an online operator between 7am-11pm.
You can also call us on 101 and cite incident 972 of Monday 23 August.
Information can also be given to independent charity Crimestoppers anonymously on 0800 555 111 or https://crimestoppers-uk.org