Unidentified gunmen attacked a police mobile in Hyderabad on Sunday night, killing at least three security personnel.
According to the DIG, the police team was on a routine patrol when they were fired upon in Latifabad.
He confirmed that three policemen succumbed to their wounds while a fourth one was in critical condition.
Sindh Chief Minister Qaim Ali Shah has condemned the incident and has called for the immediate arrest of the men responsible for the attack.
Meanwhile, police launched a massive search operation against the suspects.