Riots erupted in parts of Karachi as unidentified armed men gunned down an activist of political party in provincial metropolis on Saturday.
Police official say the slain Yawar Abbas was killed in PIB area of Karachi in firing by unknown assailants.
The angry protesters resort to violence after the incident and 3 vehicles were torched near Teen Hatti afterwards. At least 10 people sustained burn injuries when oil tanks of torched vehicle exploded.
The commercial centres and shops in different parts of the city were also forced to close.
Heavy contingent of police and rangers were immediately sent to affected area to prevent any untoward incident.