Fayyaz Laghari, Inspector General of Sindh police, told Xinhua that the gunmen opened fire at the policemen standing at the check-post on the main highway of Karachi.
The attack took place around 9.20 pm. The assailants sped away following the attack.
No one has claimed responsibility for the attack.
The attack took place shortly after the city was jolted by twin blasts, in which at least 40 people were killed and over 130 others injured.
Islamabad: Four policemen were killed when unidentified motorcycle-riding gunmen attacked a check-post in Pakistan's port city of Karachi Sunday night, a media report said.
First Published: Monday, March 04, 2013, 08:31