An unidentified motorcyclist hurled a hand grenade on people in Topawala Bazaar on Thursday injuring 21 people, police said. The man attacked civilians near Jadeed cloth house around 11:55am, police said. The injured were identified as Ramzan, Younus, Shamsur Rehaman, Muhammad Nawaz, Qadir Islam, Shair, Inayat, Najamuddin, Iran, liaqat, Allah Wasaya, Ahmad Bakhsh, Yousuf, Muhammad Irfan, Fazal and a seven-year-old girl, Hunza.