Four people were killed last night amid violence and shootings in different areas of Karachi, capital of the province of Sindh south Pakistan. Security sources said that unidentified gunmen had opened fire on two people in Federal- B-Area, leaving one of them dead and the other severely wounded. In another shooting in the same area one person was killed and another was left in \"dangerous condition\". Two other people were killed in Karimabad and Sehrab Goth in Karachi after they were attacked by unidentified assailants. Karachi, the largest city, main seaport and the main financial center of Pakistan, has constantly been a target of sectarian attacks.