Muslim Rebels

Isn’t ISIS are muslims then why they destroy their own mosque?

They believe giving special veneration to graves and relics is against the teachings of Islam.

Written on your link.

That is a shi’ite shrine being destroyed, ISIS are sunni.
Sunni and shia have been killing each other since the death of Mohammed.

And the article linked in the OP mentions ISIS attacking and destroying Sunni sites as well.

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