A number of caravans and their owners have taken residence in a Chesterfield beauty spot.
The travellers arrived at Loundsley Green park last night.
They have set up camp near a children's playground.
A Chesterfield Borough Council spokesman said the authority was aware of the situation.
"We've reported it and will be taking action," the spokesman added.
A further statement is expected to be released later.
The news comes two months after a group of travellers moved on to Holmebrook Valley Park for a weekend.
They left after verbally abusing and intimidating children, according to the council.