Story highlights ISIS has executed 3,895 people since June 2014, human rights group reports

The civilians were beheaded, thrown from buildings and burned, the group says

(CNN) ISIS has executed 3,895 people, more than half of them civilians, since announcing the establishment of a "caliphate state" in June 2014, the UK-based Syrian Observatory for Human Rights said Friday.

Of the 2,114 civilians killed, 78 were children and 116 were women, the SORH said in a press release . Civilians were killed by firing squad, beheaded, stoned, thrown off high buildings or burned, SOHR said.

The other people executed included fighters for the Syrian regime, militiamen loyal to the regime and rebel groups like al-Qaeda in Levant, SOHR said.

CNN could not independently verify the information from SOHR. Its website says SOHR is a nonprofit group not connected to any political body or nation.

ISIS even executed 422 of its own members for offenses such as trying to defect, spying for foreign counties and acts of "extremism" against Islam, such as ascribing divine characteristics to Islamic figures or another person, SOHR said.

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