The 52-year-old actress informed fans on Saturday that her nephew, model Miles Hurley, had been “repeatedly stabbed in a brutal attack in London”.
However, she has gone into more details about the attack on her Instagram page.
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The Royals star posted a snap of herself and Myles smiling together in happier times.
She told her 860,000 followers: “He was repeatedly stabbed and lost more than four pints of blood.
“A policeman was patrolling close by and administered first aid until the ambulance arrived.”
“The deepest wound just missed severing his spine”
The star continued: “The deepest wound just missed severing his spine. By some miracle no vital organs were damaged.
“We are praying that these animals are caught before they maim, or even kill, someone else. These are sad days.”
The Metropolitan Police confirmed the attack took place in Nine Elms, south-west London, at 9pm on Thursday.
A statement read: “Police were called at 8.52pm on Thursday, 8 March to Ascalon Street, SW8 following reports of a stabbing.
“Officers attended with the London Ambulance Service (LAS). A 21-year-old man was discovered with stab wounds.
“Another man, also believed to be aged 21, was also found suffering from stab wounds.
“They were both taken by LAS to a south London hospital where their conditions are described as not life-threatening or life-changing.”
It continued: “They are believed to have been attacked by a group of males (no further details) who got out of a vehicle and assaulted them before fleeing the scene.
“A crime scene was put in place; road closures were also in place but have since been lifted.
“Detectives from Wandsworth CID investigate. Enquiries continue.”
Fans left Liz and her family their well wishes on the post, with one writing: “Praying for your family right now.”
Another added: “Poor guy so sorry to hear that wishing him a speedy recovery.”