Armed police were on the runway at Manchester Airport after a Qatar Airways flight landed with an RAF escort.
A passenger on board the flight tweeted:
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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.