MINGORA  - Three persons including two teachers were killed by unknown gunmen while another 2 sustained critically injuries in Tehsil Matta in Swat district here Sunday, police said. The terrorists fired at the government's school teacher, Sarfraz Khan, a retired employee of PTCL Amir Noosh and retired Manager Habib Bank Muhammad Naeem when they were waiting for transport on roadside at village Sherbalam. As a result, Sarfaraz Khan and Amir Noosh died instantly while Muhammad Naeem sustained bullet wounds. In an another incident, police said a primary school teacher, Bakhat Jamir was shot dead by unknown assailants at Dewali village. Likewise, trader Rehimshah also came under fire near Noor village, suburban area of Mingora. He was hospitalised in critical condition in Saidu Sharif hospital. Police have registered cases and started investigation.