According to BBC News:
Two mute swans were decapitated in Birchmere Park, Thamesmead, south-east London, last month – a third was found mutilated in nearby Southmere Lake.
The RSPCA are investigating the deaths as it is illegal to harm the birds. Mute swans are protected under the Queen’s royal prerogative.
Locals, backed by the charity, have setup 24-hour patrols in a bid to catch the killers.
The Metropolitan Police said it was helping the RSPCA with the investigation.
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