Celtic Football Club has spoken out after video footage emerged online showing its supporters singing a sick chant mocking the brutal murder of soldier Lee Rigby.

The club said it is prepared to take “the strongest possible action” against any of the perpetrators involved once they are identified.

Bosses also insisted the shocking behaviour does not represent the club in any way, or its supporters.

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In the full statement, the club said: “Clearly everyone at Celtic is appalled by these events.

“Such behaviour, in no way, represents Celtic Football Club or our supporters.

“We understand this incident is now subject to an ongoing police enquiry.

“Let us be clear: in the event that any individuals are identified as being responsible, Celtic will take the strongest possible action.”

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The incident took place at the weekend in Sunderland ahead of the friendly Dafabet Cup clash at the Stadium of Light.

A spokesperson for Northumbria Police said: “We are aware of the chants that were made and are looking into these to see if any criminal offences took place and will take necessary action.”