Moscow concert hall shooting: at least 40 killed and 100 wounded in attack; roof collapsing as fire rips through venue – latest updates

More than 100 people injured in attack on Crocus City Hall as Russian officials investigate incident as terrorist attack

• Full story: shootings and fire at Moscow venue

The roof of Crocus City Hall where gunfire and flames were heard and seen on Friday night is collapsing, RIA reports.

Here are videos emerging through social media:

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