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The suicide bomb attack that has killed at least 36 people in Turkey marks the second anniversary of the Islamic State Caliphate.

Turkey’s Dogan News Agency cited police sources as saying: “ISIS is behind the attack” at Ataturk Airport.

A Turkish official, however, said it was too early to confirm any links when asked about the Dogan News Agency report.

While no official claim has been made by ISIS it comes on the second anniversary of the Islamic State Caliphate.

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(Image: Reuters) (Image: Getty)

An assault rifle of the kind favoured by ISIS was apparently found on the floor of the airport.

(Image: Reuters)

On June 28, the first day of the month of Ramadan 2014 the Shura Council of the Islamic State of Iraq and al-Sham decided to bring back the Caliphate that was abolished in 1924.

Abu Bakr al-Baghdadi was declared the "first caliph of Islam."

Al-Baghdadi was reportedly killed following US-led air strikes in Syria earlier this month.

A statement from Amaq news agency linked to Islamic State said: "Abu Bakr al-Baghdadi has been killed by coalition air strikes on Raqqa on the fifth day of Ramadan."

(Image: Getty)

Another source claimed he died in Mosul, Iraq - another ISIS-held stronghold.

In a statement from Iraqi security forces, officers said: "Iraqi aircraft hit Baghdadi's convoy as it was moving towards Karabla to attend a meeting of the Daesh [ISIS]terrorist leaders."