Dawn newspaper reported.
Separately, at least two people lost their lives as a result of indiscriminate firing in the areas of New Karachi and Orangi town.
Meanwhile, two robbers were killed and two policemen received bullet injuries during an exchange of fire in the area of Quiadabad.
Security sources say police have arrested 91 suspected criminals and recovered 27 pistols, three repeaters, stolen motorcycles and drugs from them over the past 24 hours.
Nearly 100 people have been killed in political and ethnic violence across the volatile city over the past week.
Karachi has experienced a fresh spate of violence and targeted killings over the past few months.
Sectarian, political and ethnic violence in Karachi has killed scores of people in Pakistan’s main commercial hub so far this year. The city has also witnessed dozens of incidents of targeted killings against Shia Muslims in recent months.
The developments also come days after Pakistan's top court ordered the government law enforcement agencies to take immediate action against pro-Taliban militants in the country's largest city.
The Supreme Court ordered the government in Sindh Province, of which Karachi is the capital, to take the issue of the presence of the Taliban in the city seriously.
Reports say at least 7,000 Pro-Taliban militants have made their way into the country's largest city and its commercial hub.
The city is home to numerous ethnic groups and has been hit by clashes between rival ethnic and political factions in the past two decades.
Thousands of people have lost their lives in bombings and other militant attacks since 2001 when Pakistan entered an alliance with the US on the so-called war against terrorism, according to local media.
Thousands more have been displaced by the wave of violence and militancy sweeping across the country.
Violent incidents and targeted killings have claimed lives of at least eight more people in the southern Pakistani port city of Karachi.
At least four people, including a cleric, were shot dead in separate incidents across different districts of Karachi on Wednesday, daily