A new Brighton MP has been accused of leaving Jewish constituents "abandoned and fearful" over her support for a pro-Palestinian protest.

Sian Berry has been slammed for her support of the protest, which disrupted the Brighton Pride parade in August by separating a Coca-Cola lorry from the rest of those taking part.

When it happened she wrote on X: "Well done to the campaigners who have just peacefully and firmly stopped sponsor Coca-Cola’s Pride bus next to Brighton Pavilion, isolating it from the rest of the parade, which is now sailing on by with a small diversion."

Jewish campaigners criticised the Green MP for failing to respond to constituents' concerns over the protest, which they said included pro-Hamas symbols. The campaigners have reported Ms Berry to the parliamentary standards commissioner.

Ms Berry, who took over from Caroline Lucas in Brighton Pavilion, apologised to constituents who had not received a response and said she would be “writing back in full to everyone who has been in touch”.

A spokesman for the Jewish and Proud campaign group told The Argus that concerns had been raised after Ms Berry had tweeted her support for the protest on August 3.

The group said the protest included placards with an inverted red triangle symbol on them. The symbol has previously been linked to Hamas and has been banned in Germany.

In a letter to Ms Berry, a spokesman for Jewish and Proud added: “Your silence on these concerns speaks volumes. It has left many of your Jewish constituents feeling abandoned and fearful.

“We are asking for a public acknowledgment and response to the growing sense of insecurity and marginalisation within our community, which has been compounded by your support for a protest that targeted Jewish pride and safety.”

A formal complaint to the parliamentary commissioner for standards claimed that Ms Berry had breached a number of guidelines on how MPs should represent their constituents.

The complaint claimed that she had not represented constituents conscientiously and failed to be accountable to the public, among other breaches.

Both pro-Israel and pro-Palestine groups have protested in Brighton in the months since the October 7 attacks in Israel by Hamas and subsequent attacks in Gaza and Lebanon.

Earlier this month activists carried a 500-metre-long red ribbon through Brighton city centre in protest at the ongoing Israeli offensive.

In response to the concerns, Ms Berry apologised to constituents saying she had been “reading and considering carefully the range of response to my comments and actions”.

She said: “As a long-term supporter of Pride and the LGBTIQA+ community, I recognise the link between LGBTIQA+ rights and the struggle for peace and justice for Palestine, and respect and support the solidarity between different groups of citizens that this protest represented.

“Pride sponsorship has long been a contentious matter on a range of issues and I will be continuing to engage with the fantastic Pride organisers about future events too.

"I am so sorry to hear about any constituents who feel they have experienced undue delays in hearing back from me, particularly from members of our valued Jewish community who are facing a very difficult time in so many ways.

“I have been reading and considering carefully the range of responses to my comments and actions around events in August and will be writing back in full to everyone who has been in touch, both those in support of my stance and those raising concerns. "