The World Jewish Congress (WJC) on Wednesday called on the international community to force Iran to forego any nuclear ambitions and the radical Palestinian Hamas movement to renounce violence.
"Iran is a danger for the whole world," WJC chairman Israel Singer told reporters after a one-day meeting of the US-based organisation.
Secretary general Stephen Herbits said the WJC supported efforts by the five permanent members of the UN Security Council and Germany to negotiate with Tehran, but believed there was no solution in sight yet.
"It is a very difficult process. Things are fluid. People have a sense of direction, but there is no clear path," he told a press conference.
"They must stay together and act in concert in their approach to Iran."
Herbits said the international community must deal not only with Tehran's perceived nuclear drive, but with its hardline policies on a whole.
"Firstly there is the nuclear issue. But secondly we have to make Iran grow as part of the world community in that it restrains its activities and engages with world organisations," he said.