Youths start fires in Preston's Grange Park
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From 6pm, fire crews and police were "inundated with calls" about youths "setting fires all over" the park on the east side of Preston.
Deliberate attempts appear to have been made to start grass fires, whilst a bin full of rubbish had also been set alight.
One local resident from Moor Nook said the fires are the latest incidents in an ongoing spate of vandalism in the area. Last week, around 10 wheelie bins were reported stolen from outside homes and found torched in Grange Park.
Police shared pictures of the fire damage on social media and warned parents that they face £200 fines if children are caught flouting lockdown restrictions to engage in anti-social behaviour.
The force said its control room had also been flooded with hoax calls, believed to have been made by young people.
A police spokesman said: "Tonight we have been inundated with calls for kids setting fires and causing problems on Grange Park, Preston.
"We have also being receiving hoax calls. These pictures have been taken of the aftermath. Please remember we are in lockdown.
"If your child is caught out with their friends YOU will be the ones on the receiving end of a £200 COVID fine.
"Not only are they wasting our time, they are wasting Lancashire Fire and rescue and the NHS time.
"This park is to be enjoyed, not destroyed. You are responsible for your children."