A total of 14 traveller caravans and other vehicles have gained access to part of the extended Church’s site in Northampton.
Police were alerted to the vehicles by Church’s staff after the travellers were discovered this morning on part of the company’s land that formerly belonged to the closed bus depot.
It is understood the travellers gained access to the secured site via Lincoln Road.
As it is a civil matter, officers have passed the issue on to the Countywide Traveller Unit (CTU).
A Northamptonshire County Council spokeswoman, on behalf of the CTU, said: “We have been made aware that there are currently 14 caravans on land off Lincoln Road.
“The land is privately owned and the Countywide Traveller Unit has been liaising with the landowner to advise them what action they can take.”