At least 20 people, including BNP chairperson's adviser Taimur Alam Khondaker, were injured in an attack allegedly by a group of Chhatra League men at a programme of BNP in Rupganj of Narayanganj today. Nagarik Oikya Convener Mahmudur Rahman Manna and Supreme Court Bar council executive member advocate Mar-e-um Khondaker were among the injured.