In Tamil Nadu, at least 15 persons, including four students, were injured when a country-made bomb exploded at a bus stand near Udumalpet, about 70 km from Coimbatore on Monday. The explosion occurred at Kuzhumam bus stand in neighbouring Tiruppur district. Police added that the cause of the explosion is being ascertained. Most of the injured had been admitted to local hospital and some were referred to the government hospital.