Riaz Chandio was arrested by officers of the Cant police station outside the Hyderabad Press Club.
He told The Express Tribune that he was on his way to address a press conference against land grabbers.
"A gang of land grabbers with the support of the police tried to occupy a piece of land in a village in Karachi. But one of our party leaders with the support of the local people resisted the attempt," he said.
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Chandio maintained that at his in his press conference, he wanted to expose the nexus of the land grabbers affiliated with a provincial minister.
The JSM, a faction of the Jeay Sindh Tehreek of late G M Syed, is a nationalist party which has until now taken a stance away from electoral politics.
However, recently Chandio expressed his willingness to participate in the general elections next year.
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