A policeman arranges barricades around the UN building in New York ahead of the 64th UN General Assembly.
Rights and democracy advocates were particularly targeting the appearance of Iran's President Mahmud Ahmadinejad.
A truck in New York bears a poster challenging alleged official abuses since Iran's disputed election in June.
Cycling for Human Rights in Iran challenged UN leaders to demand a probe into Tehran's crackdown. (photo: Sara Jazaeri)
Cycling for Human Rights in Iran cyclists in Toronto. (photo: Sara Jazaeri)
Thousands of members of the diaspora community were expected to travel to New York to protest Iran government actions.
Iranian-American journalist Roxana Saberi, who spent time in an Iranian jail on espionage charges, joined the protest.