Hounslow Council says it is working to remove travellers from Gunnersbury Park, where they have set up camp, 'as quickly and safely as possible'.
More than a dozen caravans arrived at the park, on the borders of Ealing and Hounslow boroughs, last night (Sunday, June 8) and early this morning.
A spokesman for Hounslow Council said: "We are aware that travellers arrived yesterday evening.
"Officers from the council are visiting the site to speak with the travellers about their presence and to assess the welfare of any children in the group.
"We will go through the necessary legal processes to remove them from the park as quickly and safely as possible and – with the police - will monitor the site to minimise disruption to local people and park users.
"We understand people may be concerned about the new site and would like to assure you that the council is doing everything in its powers to address the situation appropriately."
Carl Levesconte, who lives in Princes Avenue, opposite the park, said the gates should have been locked last night when the caravans turned up but 'maybe someone was being a bit lazy'.
Residents have alerted Ealing Council via Twitter, who responded that Hounslow Council was dealing with the issue.
@EalingCouncil A number of caravans have moved into Gunnersbury Park...— Greg Smart (@GregJSmart) June 9, 2014
@GregJSmart Thanks. Hounslow Council is dealing with this situation.— EalingCouncil (@EalingCouncil) June 9, 2014
The park gates are reported to be locked.