The plight of Iran's seven imprisoned Baha'i leaders has been capturing the public's attention in 12 of the world's major cities, where a day of action marked the combined total of 10,000 days that the seven have so far spent in prison.

In an initiative coordinated by human rights organization United4Iran, the image of the seven was widely displayed on Sunday 1 April – on mobile billboards, buses, bicycles, a canal boat, and T-shirts.

The billboard image of the Baha'i leaders was a mosaic of smaller photographs of hundreds of people currently jailed in Iran including journalists, trade unionists, politicians, student and women's activists, and religious leaders.

"The plight of these seven is representative of the countless Iranian men and women who have been jailed for defending their freedom and human rights," said Firuzeh Mahmoudi, United4Iran's director and founder.

"Our message to the seven is this: The world has not forgotten you, and we will continue to fight for your freedom and that of other Iranian prisoners of conscience."

In New Delhi, India, around 200 campaigners carrying banners marched across the city in an action that was co-supported by the Trans Asia Alliance and the Asian Center for Human Rights. The Center's director Suhas Chakma said, "Iran has failed to respect international human rights standards on fair trial and therefore must release the seven unconditionally."

In South Africa, buses displaying the image of the seven prisoners are following routes in Johannesburg, Cape Town and Pretoria.