The key opposition figure, in his late 70s, was hospitalized for two months last fall and underwent a surgery.
A Bahraini appeals court confirmed one-year sentence against him and stripped him of the country’s citizenship in January.
Sheikh Isa Qassim is leading an opposition movement in Bahrain against Sunni al-Khalifa dynasty demanding an elected government in the Shia majority country.
According to the sources, the al-Khalifa regime has denied him appropriate treatment so far.
He has been under house arrest for more than 324 days now.
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