The German city of Braunschweig cancelled a planned carnival procession Sunday because of a "specific threat of an Islamist attack", police said.

The event, which was to begin at 1120 GMT, was called off two hours earlier following a tip by "reliable state security sources", police said in a statement.

"Police request all visitors not to go to the planned parade route or not to make the trip to Braunschweig in the first place," the statement said.

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