Shops owners kept their shutters down for two hours yesterday in Rohonpur municipal area of Gomostapur upazila, brought out a procession, held a rally and submitted a memorandum to upazila nirbahi officer protesting arrest of a businessman. Before submitting the memorandum, the speakers said at the rally, held at upazila parishad premises, that local Jubo League leader Shamirul Islam Mukul filed an extortion case with Gomostapur police station against Ruhul Kuddus Sentu, a medicine shop owner on Wednesday. Police arrested him the same day. Terming it a false case they demanded immediate release of the trader.