Confusion surrounds the movements of an Islamic leader who spoke at a London event despite an apparent ban from entering the country.

Raed Salah, leader of the northern branch of the Islamic Movement in Israel, addressed an audience at Conway Hall last night about the Arab Spring’s effect on Palestinians.

But the Evening Standard has reported that police are searching for Mr Salah, who has been accused of having a “history of virulent antisemitism”, and sent detectives to the event last night.

He is due to share a platform with MPs and campaigners at an event, organised by the Palestine Solidarity Camapign, at the House of Commons tomorrow.

Mike Freer MP, who represents Finchley and Golders Green, asked Home Secretary, Theresa May about the case in the House of Commons yesterday.

He said: “The Home Secretary will be aware that Mr Raed Salah has been invited to speak in the palace precincts. Given this man’s history of virulent antisemitism, will the Home Secretary ban him from entering the UK?”

But Mrs May said she would not comment on individual cases.

The Met, Border Agency and Home Office refused to comment further.