KARACHI(PAKISTAN): The toll from the fresh spate of violence that erupted in the metropolis Saturday, has mounted to 24 people and over 50 others are injured; while, unidentified armed men forced shops in different areas to close.Meanwhile, five vehicles including a staff van of a private television channel have been reportedly torched in different areas during the violence-ravaged incidents.The violence spread in several parts of the city after unidentified attackers opened fire and injured a man named Zafar in PS-94 constituency of Orangi Town where by-election is underway since 8am. In another firing incident at Katti Pahari area where armed men opened indiscriminate firing on a passenger bus, killing a youth identified as Tausif and injuring two others.A man identified as Akbar was shot dead and two others sustained injuries when unknown armed motorcyclists opened fire at Abul Hasan Ispahani Road.In yet another firing incident in Garden area 3 men were killed.In similar such incidents at Kamran Chowrangi, Ayub Goth, Banaras one man each was shot dead while two men were injured in Ranchor Line.According to hospital sources, more than four dozens men were injured in firing incidents.Most of the areas are still blanketed with tension while police claimed to have apprehended four miscreants in Orangi Town and they have been moved to unidentified location for investigation.Hospital and police sources confirmed killing of 21 persons and the number of injured persons.