The US State Department accused the group of overseeing widespread human rights abuses including mass executions and rape across Iraq and Syria.They were added to the 'Rewards for Justice' program yesterday as America sought to ratchet up pressure on the terror group after it claimed responsibility for an attack in Texas on Sunday.
The militant with the largest bounty – $7million is Abdel Rahman Mustafa al-Qaduli, who was designated a global terrorist for the purpose of U.S. Treasury sanctions in May last year.
The State Department alleged that he had been a deputy to the late leader of Al-Qaeda's Iraqi faction, Abu Musab al-Zarqawi, and had travelled to Syria to join ISIS in 2012 after he was freed from an Iraqi jail.
The U.S. Treasury lists Qaduli as an Iraqi, born in either 1957 or 1959 in the city of Mosul.
A Syrian militant, Abu Mohammed al-Adnani, whose birth name is Taha Sobhi Falaha and who is around 38 years old, is subject to a $5million reward for information leading to his death or capture.
The statement describes him as an ISIS spokesman who has repeatedly called for attacks on the United States.
Tarkhan Batirashvili, better known under his Arabic nom de guerre as Omar al-Shishani, is also under a $5million reward.
The 29-year-old Georgian is accused of overseeing a prison outside the ISIS stronghold of Raqqa where several foreign hostages were held.
There is a $3million bounty on the head of Tariq bin al-Tahar bin al-Falih al-Awni al-Harzi, a 33-year-old Tunisian.
He is accused of acting as an ISIS fundraiser in the Persian Gulf states and later as a field commander in Syria and as head of a unit of suicide bombers.
The Iraqi leader of the ISIS group, Abu Bakr al-Baghdadi, was already the subject of a $10million reward under the program.
Most wanted on the list – with a $25million bounty – is Ayman al-Zawahiri who became leader of Al Qaeda after Osama bin Laden was shot dead in 2011.
ISIS has seized a wide stretch of eastern Syria and northern Iraq and declared it a caliphate, within which it has enslaved female captives, carried out sectarian massacres and murdered hostages.
They also appear to have spread their influence to American soil.