At least 20 persons were injured as the law enforcers chased the activists of BNP in the city’s Topkhana Road after they brought out a procession on Thursday morning defying police restriction when party Chairperson Begum Khaleda Zia was going to appear before a special court at Bakshi Bazar Alia Madrassa. (inset) An unidentified person threw stone and smashed the windshield of a NSI official’s car when several vehicles got stuck in the traffic jam near National Eidgah in the city during the returning of BNP Chairperson Begum Khaleda Zia from Bakshi Bazar court.