The dreaded terror group Islamic State is planning a new coordinated attack across Europe, according to a former terrorist linked to the outfit, according to PTI.

The horrifying plan has been revealed after a former ISIS terrorist, identified only as Harry S, escaped the terror group and is now being questioned by authorities in Germany, the Daily Express reported.

The German terrorist witnessed beheadings and executions in Syria for three months but fled after he could no longer stand its brutality.

“They want something that happens everywhere at the same time. All you need is to take a big knife, and go down to the streets and slighter every infidel you encounter,” he has reportedly told his interrogators.

Harry S admitted he had been leading mass executions and holding weekly ideological training sessions in Raqqa, Syria.

In a video in May, he was spotted with the Islamic State flag before other German-speaking militants called on supporters across the world to kill “infidels”. The video ended with the militants shooting two prisoners dead, the newspaper reported.

Harry S now stands accused of membership of a terror group and faces a lengthy prison sentence if convicted.

ISIS has claimed responsibility for the November 13 Paris attacks which killed 129 people.

History of ISIS

The Islamic State was founded in 1999 by Jordanian radical Abu Musab al-Zarqawi under the name Jamāʻat al-Tawḥīd wa-al-Jihād(lit. “The Organisation of Monotheism and Jihad”). In October 2004, al-Zarqawi pledged allegiance (Bay’ah) to al-Qaeda leader Osama bin Laden and renamed the group to Tanẓīm Qāʻidat al-Jihād fī Bilād al-Rāfidayn(lit. “The Organisation of Jihad’s Base in Mesopotamia“), commonly known as al-Qaeda in Iraq or AQI. Under al-Zarqawi, the group participated in the Iraqi insurgency following the March 2003 invasion of Iraq by Western forces.

In January 2006, the group joined other Sunni insurgent groups to form the short-lived Mujahideen Shura Council. After al-Zarqawi was killed in June 2006, the Mujahideen Shura Council merged in October 2006 with several more insurgent factions to establish ad-Dawlah al-ʻIrāq al-Islāmiyah, also known as the Islamic State of Iraq (ISI), led by Abu Omar al-Baghdadi and Abu Ayyub al-Masri, who were killed in the US–Iraqi operation in April 2010, being succeeded by Abu Bakr al-Baghdadi as the group’s new leader.

In August 2011, following the outbreak of the Syrian Civil War, ISI, now under the leadership of al-Baghdadi, delegated a mission into Syria, which under the name Jabhat an-Nuṣrah li-Ahli ash-Shām (or al-Nusra Front) established a large presence in Sunni-majority ar-Raqqah, Idlib, Deir ez-Zor, and Aleppo provinces.

In April 2013, al-Baghdadi decreed the reunification of the Syrian al-Nusra Front with ISI to form the “Islamic State of Iraq and the Levant” (ISIL). However, Abu Mohammad al-Julani and Ayman al-Zawahiri, the leaders of al-Nusra and al-Qaeda respectively, rejected the merger. After an eight-month power struggle, al-Qaeda cut all ties with ISIL by February 2014, citing its failure to consult and “notorious intransigence”.

In early 2014, ISIL drove Iraqi government forces out of key cities in its Anbar campaign, which was followed by the capture of Mosul and the Sinjar massacre. The loss of control almost caused a collapse of the Iraqi government and prompted a renewal of US military action in Iraq. In Syria, the group has conducted ground attacks on both government forces and rebel factions.