More than 20,000 people in various venues in London attended the British Zionist Federation’s “Minute for Munich” program that was promoted via social media.

A short memorial service at the Israeli Embassy that was organized by the Zionist Federation was streamed live online today, according to the London Jewish Chronicle.

About 200 people marked the Minute for Munich in Trafalgar Square, reciting memorial prayers and lighting memorial candles. Afterwards, they waved British and Israeli flags in front of media who attended the event.

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“The British Jewish community is showing its solidarity with our brothers and sisters in Israel,” the British Israel Coalition’s Ari Soffer told the crowd, according to the Chronicle. “We should not allow this tragedy to go uncommemorated. This is a time to show our respect and remember the dead.”

The families of the victims of the 1972 Munich massacre, in which 11 Israeli Olympics athletes and coaches were murdered by Palestinian terrorists, have mounted a global campaign to get the International Olympic Committee to hold an official moment of silence at the Games.

The IOC continues to reject the call, despite its being endorsed by President Obama, GOP presumptive presidential nominee Mitt Romney, the U.S. Senate, the German Bundestag, the Canadian and Australian parliaments, about 50 members of the British Parliament, the Israeli government, Jewish organizations worldwide and about 100 members of Australia’s Parliament.

IOC president Jacques Rogge on Friday said the IOC had not been pressed by any government to hold a moment of silence.

“There has been no pressure from any nation whatsoever,” Rogge said. “The IOC has always honored the memory of the victims of Munich ’72.”

Rogge led a minute of silence for the victims inside the athletes village on Monday, will attend a private ceremony in London during the games and will take part in a commemoration on the 40th anniversary on Sept. 5 at the Munich airport where most of the Israelis died.

“We have always commemorated and will continue to commemorate the memory of the killed athletes,” he said.