The SDF says it had been working since May 15 with the CIA to track down Abu Bakr al-Baghdadi [Manish Swarup/AP]

The Islamic State of Iraq and the Levant (ISIL or ISIS) group leader Abu Bakr al-Baghdadi‘s underwear was obtained by an undercover source and DNA-tested to prove his identity before an operation by US forces to kill him, an adviser to the Syrian Democratic Forces said.

Polat Can, a senior consultant to the Kurdish-led SDF militia, gave details on Twitter on Monday about how SDF intelligence work helped locate al-Baghdadi.

“Our own source, who had been able to reach al-Baghdadi, brought al-Baghdadi’s underwear to conduct a DNA test and make sure [100 percent] that the person in question was al-Baghdadi himself,” Can said.

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