Authorities have filed a case against unidentified persons over vandalisibg the gate and several stalls of the old trade fair in the capital. The case alleges that goods worth Tk 30 lakh to Tk 35 lakh were damaged.On Wednesday morning, some students of Sher-e-Bangla Agricultural University (SAU) allegedly went there with a procession demanding the recovery of the field. At one stage, they vandalized a gate and stalls built for the Asia International Fair.Recently, an announcement was made t...