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 Islamic centre where the Manchester suicide bomber is thought to have prayed says the attack "has no place in Islam or any religion".
German chancellor Angela Merkel and Indian prime minister Narendra Modi among those to praise "great spirit" of Manchester people.
The bomber's identity has been confirmed by Greater Manchester Police.