Odhikar's secretary Adilur Rahman Khan Suvhro, who is allegedly linked closely with right-wing Jamaat-e-Islami, was arrested under Information and Technology Act last night.
"He has been arrested under the under Information and Communication Technology Act," a police spokesman today told newsmen, adding Detective Branch officials picked him up from his residence at up market Gulshan area here.
The spokesman added detailed information about the arrest would be released soon.
The newly floated Hefazat, allegedly backed by Jamaat and main opposition BNP, had enforced their Dhaka siege programme on that day sparking a deadly violence.
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Officials conformed deaths of 21 people including policemen in Dhaka and the outskirts of the capital, and south-eastern port city of Chittagong on May 5 and on the next day while pro-opposition newspapers at that time put the figure as high as 28.
A former left leaning activist, Shuvro is also now allegedly linked closely with Jamaat, whose leaders are now facing justice for the 1971 liberation war time "crimes against humanity" siding with Pakistani troops.
Meanwhile, BNP strongly condemned his arrest calling it "nothing but part of government conspiracies" and demanded his immediate release.