An investigation is ongoing following a complaint of an assault during the March to Leave protest in Sunderland.
A woman, 48, has reported the alleged assault to Northumbria Police and said she was pushed in the chest during the protest, which was led by former Ukip leader Nigel Farage ,
It is understood that a video of the alleged assault had been posted on social media but has since been deleted.
A spokesman for the force said: “We can confirm we received a call from a 48-year-old woman reporting that she had been pushed in the chest during a protest in Sunderland on Saturday morning.
"Inquiries into the incident are ongoing at this time.”
The protest, which started in the city, has been organised by the Leave Means Leave campaign - with the first day of the event ending in Hartlepool.
It was organised in a bid to avert perceived attempts to betray the public over Brexit. It will end in London on March 29.