The sketches of the attackers have been prepared with the help of 10 eyewitnesses, police sources said.
The released sketches show the two attackers in caps, while the third killer had worn a helmet and the fourth sporting sun-glasses.
The eye-witnesses saw the prepetrators of the crime when they were firing over the victim policemen, police said. Four witnesses saw the culprits closely. The police recorded the statements of the witnesses and prepared sketches in the light of the details given in these statements, officials said.
Armed terrorists attacked two police parties within the span of few minutes. The policemen were deployed in Karachi’s Orangi Town for providing security to the polio vaccination teams in the area.
Police has also announced Rs. five million bounty for those who will provide information that will lead to the arrest of the culprits.