A Twitter account thought to be run by a British Islamic State jihadi has leaked the home address of a second decorated US soldier calling for reprisal attacks.
The threat was allegedly published under the name Umm Hussain Britaniya - one of the aliases used by Sally-Anne Jones - and included details and family photographs about Sergeant Dillard Johnson.
The message claimed the information was being made public "to cause havoc in his life and for my brothers and al Qaeda in the US to eventually hunt him down and kill him".
It read: "Apparently he is supposed to be America's deadliest soldier who the most number of kills in Iraq, rumoured to be 2,746 during Operation Iraqi Freedom.
"He claims he killed 2,476 combatants in Iraq with everything from a .25mm chain gun to a sniper rifle to a hunting knife.
"But once he got home just like Robert O'Neil he also boasted about US operations and he wrote a book called Carnivore and now lives off the proceeds with his wife and family who I shall post details of below.
"Once again I leave these details online to cause havoc in his life and for my brothers and al Qaeda in the US to eventually hunt him down and kill him."
Sgt Johnson published the book Carnivore in 2013, in which he is called "one of the deadliest American soldiers of all time".
He served two tours in Iraq in 2003 and 2005, but has insisted the number of alleged enemy kills he was associated with was not true.
It comes after Rob O'Neill, the Navy SEAL who shot dead Osama bin Laden during the raid on a compound in Abbottabad in May 2011, hit out after he was threatened online .
Mr O'Neill also apparently had his home address published online by Jones and was labelled a "number one target".
He told Fox News' Hannity show: "I've been ready for this since we killed Osama bin Laden. I know how to defend myself."
Jones, 46, from Chatham, Kent, was put on a UN sanctions list last month which includes travel bans and asset freezes.
She travelled to Syria in 2013 with her husband Junaid Hussain. Hussain was killed in a US drone strike in August.
Jones is alleged to be a recruiter for IS.