"We will continue our struggle, from the streets, from the computer, from the office, to stand up for the human rights of all Palestinians," he said.
"We hope and we pray for the end of Zionism. It is a curse. It is a cancer."
Sean Clinton of the Ireland-Palestine Solidarity Campaign called on supporters to boycott Israeli diamonds.
Scottish Palestine Solidarity Campaign chair Mick Napier claimed 50 per cent of young Israelis wanted to flee the country because of its "black, dark, horrible name". He encouraged those at the rally to protest against Israel's Batsheva dance company when it performs at the Sadler's Wells venue in central London in November.
Reverend Stephen Sizer, senior pastor of the Anglican Christ Church in Virginia Water, Surrey, said "no country on earth recognises Israeli sovereignty over Jerusalem" apart from Israel and called for an end to "45 years of military occupation".
The Board of Deputies and Jewish Leadership Council had led complaints to Transport for London after the event was advertised on London buses.