London: Amnesty International says it is investigating how fake blog posts attacking Syria’s opposition came to be posted on its website.

The human rights group did not provide details, but it was possible the article was the result of hacking by supporters of President Bashar Al Assad’s regime.

The blog post claimed that a research mission conducted by Amnesty inside Syria has uncovered “crimes against humanity committed by the Syrian rebels,” including prisoner abuse and execution.

The post called on the United Nations to impose an arms embargo on nations supporting the Syrian opposition.

Amnesty said it was alerted to the blog posts Monday and immediately removed them.