A man found in possession of a plastic sword was detained by police.
Officers were called at around 2.22pm to Maygrove Peace Park in Kilburn.
A Metropolitan Police spokesperson said they were called due to "concern around a man in the park in Maygrove Road".
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Police attended the scene and detained the man, and they found the plastic sword.
Two police vehicles attended the scene and parked in Maygrove Road.
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