One year ago this week, three Americans trekking in northern Iraq near the Iranian border were arrested and locked up in Tehran's notorious Evin Prison, accused of entering Iran illegally.
Despite extensive public attention, the efforts and support of high-level U.S. officials and other prominent figures, and a visit to Tehran by the trio's mothers, the friends widely known as "the American hikers" remain in limbo - even as other foreigners detained in Iran in recent years have generally been freed within weeks or months.
The fact that the hikers were arrested just six weeks after violent antigovernment street protests erupted in Tehran, and against the backdrop of U.S.-led pressure to curtail Iran's nuclear fuel-enrichment program, made them particularly vulnerable as political pawns, analysts say.