Travellers have moved onto a city park and managed to get stuck in the mud on their way in.
The travelling group moved onto Wild Park, Brighton, this morning and caused traffic tailbacks as they tried to move their vans through the thick mud.
Residents have reported the travellers opened the gate themselves to gain access to the park.
One group arrived yesterday evening and a second group arrived this morning.
Approximately 50 vans and vehicles are now on the site.
A spokesman for Sussex Police said: "Sussex Police are attending a report of a number of vehicles stuck in mud at Wild Park in Brighton.
"It would appear that travellers who started to arrive at around 10.15am on Friday (May 30) have blocked the entrance and created a tailback on to the A270 Lewes Road."
The blockage is now cleared and traffic is moving freely.