He went without food for 28 days to protest his solitary confinement in 2005 when he was imprisoned by Israel. His sister said his strike forced Israeli authorities to return him to live with other prisoners.
He also undertook a 12-day hunger strike in 2010, again when he was arrested by the Palestinian Authority, which rules parts of the West Bank. Musa said her brother wasn't charged with anything, and was quickly released.
Adnan's latest protest was the longest hunger strike ever by a Palestinian prisoner, and had caused some unease in Israel. The European Union and United Nations had expressed concern over the case and urged Israel to promptly give Adnan a trial.
There are some 300 Palestinians in Israeli administrative detention. They are a fraction of the some 4,200 Palestinians held in Israel, many who are doing time for charges ranging from throwing stones at Israeli soldiers to killing Israeli civilians.
Palestinians venerate the prisoners, viewing them as freedom fighters.
The second longest hunger strike in Palestinian history was by a woman, Itaf Alayan, who refused food for 43 days before she was released in 1997. She was also an administrative detainee.
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