Interior Minister Rehman Malik said that security forces had been given orders to shoot gunmen on sight to meet the challenge.
The violence has rocked the country's financial hub and continued today although a total shutdown was observed in the city on the call for a day of mourning by the MQM for the people killed in the violence.
Rockets were fired and grenades lobbed as violence wracked the city with thousands of people stranded in their home in fear of flying bullets.
The violence also escalated after President Asif Zardari issued orders to restore the commissioner''s system in the city.
Police and rescue officials said that in four days 95 people had been killed with some 200 wounded in target killings and indiscriminate firing in many parts of the city, owing to political as well as ethnic clashes.
The decision to restore the commisioner's system was taken at a high level meeting in Islamabad which also proposed amendments to the local bodies system.
The MQM leadership said it opposed this decision and senior member Raza Haroon said that MQM will oppose it in the assembly.
Struck by the magnitude of incidents in Karachi, the US Embassy in Islamabad today said it is deeply concerned about the escalating violence in the port city.