Violence spread to various parts of the city on Thursday following the killing of three Sunni Tehrik (ST) activists late Wednesday night. In the violence on Thursday three men, a woman and a girl were injured in firing and three public transport vehicles were set on fire in the city, the police said. Two ST activists, Faizul Hasan, 35, and Ashraf Sammon, 32, were shot dead on M A Jinnah Road. Danish Hameed, who was shot in Ramaswamy, died in a hospital late Wednesday night. Later, violence erupted in Ramaswamy, Ranchhore Lines, Kharadar, Garden, Bohrapir, Chuna Bhatti, New Karachi, Lines Area, Al-Falah, Shah Faisal Colony, Landhi and Lyari where miscreants fired in the air and forced shopkeepers to pull their shutters down. A passenger coach was set on fire in Arambagh. Clashes were reported between ST and MQM workers in New Karachi, where two minibuses were set on fire. In Lines Area, Shah Faisal Colony, Al-Falah, and Landhi, miscreants pelted vehicles with stones. Police patrolling was intensified in the troubled areas. Tension was prevailing in the areas.