Iran is to free seven crew members from the detained British-flagged oil tanker Stena Impero, according to Iranian state TV.
Abbas Mousavi, a spokesman for Iran's foreign ministry, told the broadcaster they were being freed on humanitarian grounds and would be allowed to leave the country soon.
The Stena Impero was detained by Tehran on 19 July, two weeks after Britain detained an Iranian tanker - the Adrian Darya 1 - off the territory of Gibraltar.
The Iranian vessel, previously known as the Grace 1, was released in August amid speculation that it planned to transport its cargo to Syria, in breach of European Union sanctions.
The vessel, which is hauling $130m (£106m) worth of light crude oil, had been in Gibraltar since 4 July.
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