Mishra, who was a student of JNU's Center for Chinese and South East Asian studies, was arrested on Saturday along with two others in Aheri taluka of Gadchiroli district in Maharashtra.
Addressing a press conference here, members of Jawaharlal Nehru University Students' Union (JNUSU) said Mishra was a cultural activist who had been "arbitrarily" arrested by the Maharashtra Police.
JNUSU general secretary Shakeel Anjum said Mishra was physically challenged and was being wrongly projected as a 'prominent Naxal courier' to the media by the police.
Mishra's brother Deepak, who was also present at the conference, said that he got to know of his arrest yesterday from media reports.
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"These are baseless charges. We were concerned as we had been trying to call him for the last three days. His friends told me that they could also not get through him," he said.
K J Mukherji, professor at JNU's School of Biotechnology, said it was concerning as to how people were being picked by police and labelled as Naxalites.
Representatives of several student and cultural organisations were present at the press conference.
Mishra, who hails from Almora in Uttarakhand, was arrested with two others for alleged links with ultras after they were found moving in a suspicious manner in Gadchiroli.
According to Gadchiroli police, a micro chip containing some vital information and secret documents allegedly meant to be handed over to senior naxal cadre was found to be in possession from the three arrested.