People have laid down on a main carriageway, causing traffic chaos.
The incident is currently taking place along the seafront in Brighton.
Police said: "We are aware of a pre-planned peaceful demonstration by a disabled lobby group outside the Public & Commercial Union (PCS) conference at the Brighton Centre at lunchtime today.
"A small number of the demonstrators laid down in the carriageway but one lane is clear for traffic. We are in discussion with that group as to their intentions."
Did you witness the people in the carriageway or photograph them?
Email anna.roberts@theargus.co.uk
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