Inspector General of Police (IGP) Kashmir V K Birdhi Friday said that the recent TRC grenade attack case in which 12 civilians were injured has been solved and three terror associates involved in the act of grenade lobbing have been arrested and booked under UAPA. He said that the arrested persons have been identified as Usama Yasin Sheikh, Umar Fayaz Shiekh and Afnan Ahmed, all residents of Ikhrajpora, Srinagar. IGP said the are affiliated with the Lashkar-e-Toiba terrorist outfit