An investigation has been launched after swastikas were drawn on a commemorative D-Day bench.
Police said a number of areas in Twyford Woods, Lincolnshire, had been vandalised between Sunday and Monday.
The site was used as an airfield in the Second World War for aircraft to take off for Normandy ahead of D-Day.
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Lincolnshire Police are appealing for witnesses after a disused fuel drum, a wall and the commemorative bench were targeted with silver and white spray paint.
In a statement, the force said: "Between Sunday 9th June and Monday 10th June, a number of areas within the Twyford Woods site have been defaced with swastikas in silver and white spray paint.
"This includes a commemorative bench which has been extensively vandalised.
"We are appealing for witnesses to this vandalism and anyone with any information that can assist with our investigation to contact us."