Speaking exclusively to ITV News, Badar Azim said that the moment he posted the official announcement of the birth of Prince George felt "great."
"Obviously it was a proud moment for me."
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The footage, taken from a dead Islamic State militant, shows the fighters in a chaotic and panicked battle with Peshmerga forces.
Solicitors acting for 20 of the families said they were "appalled to see the shambles in South Yorkshire Police" following the inquest.
The two men are accused of meeting with Mohamed Abrini and giving him money.