Pakistan's southern port city Karachi observed a day of mourning Wednesday after four days of violence left more than 70 people dead and dozens injured, the police said, DPA reported.
The clashes between rival ethnic and political groups erupted on Saturday ahead of by-elections for a regional assembly seat in Sindh province, of which Karachi is the capital.
On Tuesday, gunmen on motorbikes opened fire in a busy market, killing a dozen merchants and shoppers. The onslaught was followed by various incidents of shooting and targeted killings citywide.
Senior police officer Iftikhar Tarar told German Press Agency dpa that "30 plus" people died in the shooting over 24 hours.
"Altogether, over 70 have died in the recent wave of violence that started on Saturday," he said.
Most of the victims were workers of the Muttahida Qumi Movement, (MQM), the Awami National Party and the ruling Pakistan People's Party. The three groups have a long history of rivalry.
Schools and businesses were closed while public transport remained off the roads in the metropolis of about 18 million people.
Hundreds of enraged MQM workers set to fire several vehicles and shops. They also scuffled with military troops deployed in the city.