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The protest bid coincides with the 20th anniversary of the capture of Kurdish militant leader Abdullah Ocalan, who is jailed in a notorious prison island near Istanbul.

Leyla Guven of the pro-Kurdish Peoples' Democratic Party (HDP), launched her action on November 8 while in jail to protest against Ocalan's prison conditions.

She was freed last month under judicial supervision but continued her protest, refusing any treatment. Guven, 55, is consuming only sugared or salted water.

Police on Friday blocked supporters from approaching Guven's house in the Kurdish-majority city of Diyarbakir after a rally called by the HDP, an AFP correspondent said.

"The biggest task ahead of us today is to turn every aspect of life into an arena for struggle and support hunger strikes at the highest level," HDP MP Dilan Dirayet Tasdemir said.

"This dark picture and severe conditions of fascism can only be broken through our organised struggle," Tasdemir said.

More than 200 prisoners are on hunger strike to protest what they call Ocalan's isolation, according to the HDP.

Ocalan, one of the founders of the outlawed Kurdistan Workers' Party (PKK) that has waged a bloody insurgency against the Turkish state since 1984, has not been allowed to see his lawyers since 2011.

The PKK is blacklisted as a terror group by Ankara and its Western allies.

Ocalan was caught in Kenya outside the Greek embassy in Nairobi on February 15, 1999 by Turkish secret service agents after attempting to seek asylum in Europe.

Turkish authorities last month allowed Ocalan's brother Mehmet to see him, the first visit in over two years.