The United States says it is "deeply" concerned by reports that Iranian authorities attacked peaceful women's rights protesters at a gathering to mark International Women's Day, Radio Farda reported.

All but three of a group of women arrested during a peaceful protest in Tehran on March 4 have been released.

An Iranian Nobel Peace laureate and the head of rights group Amnesty International have made a joint call for an end to Iranian laws that discriminate against women.

The United Nations' high commissioner for human rights has expressed concern about the jailing in Iran of more than 30 women activists.

The United Nations' high commissioner for human rights, Louise Arbour, has expressed concern over the detention in Iran of at least 31 women activists who had gathered peacefully in Tehran.

Amnesty International has called for the immediate release of more than 30 women activists who were arrested on March 4 while staging a peaceful protest in Tehran.

More than 30 Iranian women have been arrested in Tehran for protesting against government pressure being put on women's rights activists.

The French media-rights group Reporters Without Borders (RSF) has condemned the arrest of three women's rights activists and journalists in Iran.

Three Iranian women's rights activists and journalists have been released from detention, Radio Farda reports.