In two ghastly attacks on that day, five people were killed and two injured seriously.
Gunmen riding motorcycles shot at a group of men sitting at a roadside tea shop, killing three, two of them brothers, and injuring their fourth companion who later succumbed to his injuries in the hospital.
Earlier in the day, two gunmen opened fire on a bus carrying PTCL employees, killing one of them on the spot and wounding another.
Luckily, the bus had only seven passengers; otherwise the casualty figure could have been higher.
It is yet to be established as to who is behind these horrible crimes. But for the residents of Karachi, these incidents would be a chilling reminder of the bloody ethnic violence that created a general air of fear and lawlessness in the city not too long ago.
In fact, Tuesday's killings came in the wake of the arrest of a prominent leader of an ethnic group, making many to wonder if there was a connection between the two events.
Whatever be the reason for these abhorrent crimes, they reflect an alarming situation.
Those responsible for the maintenance of law and order may argue that it is not possible for them to guard each and every public place and vehicle. And rightly so.
However, maintenance of law and order is not about providing physical security at all places all the time. A large part of it comprises intelligence work.
The police are supposed to have information on potential miscreants in their respective areas of jurisdiction and the possible motives of such elements to commit crime, so as to take preventive action.
The killings in Karachi show that the police had no clue what was about to hit their own men, not to mention the attacks on ordinary people.
Unfortunately, the police's prosecution side is equally weak. That became quite obvious during the earlier spell of violence in Karachi.
Too many times, suspected culprits were arrested but later released for lack of evidence. Quite understandably, ordinary people are scared to come forward as witnesses against dangerous criminals.
That is where the investigation wing of the police has a special role to play. It must find the necessary evidence to help the prosecution prepare a case that can stand in a court of law.
In the past, our investigation agencies lacked the necessary know-how as well as facilities such as forensic equipment, but not any more.
Certain western countries are known to have supplied the local law enforcement agencies with modern equipment to enable them to track down suspected terrorists.
Their experts have also been visiting here to carry out their own investigations into some high profile cases of terrorism.
Our law enforcement agencies were expected to learn some useful investigation techniques from their western counterparts. So far there is little indication that they have.
The Sindh government as well as the Federal Interior Ministry must pull their act together and do the needful to restore the public's sense of security.