At least five people were killed and several others were injured including two policemen in the incidents of violence and riots linked to the call of strike against energy crisis by some political groups here in Karachi on Friday morning, police said. Meanwhile, unidentified miscreants have set five trucks on fire near Al-Asif square here in metropolis. According to the details, several incidents of firing in areas including Al-Asif, Quaidabad, Sohrab Goath, Malir, Maripur, superhighway, Mosamyat Chowrangi and many others have been reported after the dawn. A man has been shot dead near Mosamyar roundabout while another man has been gunned down in Malir 15. In another incident, one man was killed and other was injured in Quaidabad area. A number of miscreants have come out on superhighway and blocked the traffic after setting on fire five trucks, which left five men injured including two police personnel. Later, miscreants resorted to aerial firing to trigger panic among people and ran rampage after blocking the highway at Al-Asif. More than seven people were injured and five were killed in incidents of violence and firing across metropolis since dawn,. After the incidents, police and law enforcement agencies including Rangers reached the places of riots and started bringing the situation to normalcy. Police started investigations of the incidents.