The move aims to bring attention to the fear many Afghan women have of the potential consequences of appearing in public or having their photographs published, said Rob Few, chief of communications for the UN Development Program in Kabul.
Photographs already on the UNDP's Afghanistan website would be blacked out starting today, and replaced with the hashtag #WhereAreTheWomen, Few said.
Original captions would remain, so visitors to the site know what they are missing, and no new photographs would be posted, he said. The campaign will last about a week, he added.
High-profile women have been murdered. As a result, few women work outside the home or are active in public life, despite constitutional guarantees of their safety.
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Few said the UNDP's decision came after an Afghan woman helped by the agency to escape an abusive forced marriage said she was too afraid to have her photo published alongside a report about her experience.
"Walk down any street, or into any government office, or into any hospital, police station, business or university, and you have to ask yourself, 'Where are the women?' Few said.
As the Afghan government moves toward a dialogue with the Taliban to end the war, now in its 15th year, many women fear that hard-won legal rights will be sacrificed for peace.