Mayor of London Boris Johnson has said he was "very, very sorry" for comments he made in a 2004 article about Liverpool fans being partly to blame for the Hillsborough disaster.
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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.