The text is signed by "The prince of believers", thought to refer to ISIL chief Abu Baqr al-Baghdadi.
Before being crucified, the man was killed by three bullets to the head at Bab in the north of Aleppo province, the Syrian Observatory for Human Rights said.
Mainstream Syrian rebels and the Al-Qaeda-linked Al-Nusra Front accuse the jihadists of ISIL of responsibility for a string of atrocities.
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Before being crucified, the man was killed by three bullets to the head at Bab in the north of Aleppo province, the Syrian Observatory for Human Rights said.
Mainstream Syrian rebels and the Al-Qaeda-linked Al-Nusra Front accuse the jihadists of ISIL of responsibility for a string of atrocities.
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