Karachi Police have arrested a security guard of a petrol pump on Saturday who gunned down a suspected robber in Jamshed Quarters, reported 24NewsHD TV channel.
The security guard opened fire with a 12-bore rifle as two thieves were getting away on a motorbike.
The security guard told the Karachi police that the two were thieves, bike ride got away and the other fell after hit by a bullet fired by him.
Police launched further investigation in the light of CCTV footage.
The body of the deceased alleged thief was shifted to the morgue.
Reporter Saud Bin Murtaza