Wow! The "Blue Mosque"! I had my whole family there, playing tourists years back. I didn't go in the Mosque though, wife and son did. I didn't feel right playing the role of Infidel, hung around outside, probably about where the bomb went off!
When did they cheer for Isis? They chanted "God is Great" in remembrance of the victims. I know that doesn't fit the narrative to the West so they characterized it as something else.