Two people have been arrested over the shooting death of a senior diplomat from Kazakhstan in Pakistan, police said on Saturday. Sapargali Aubakirov, deputy head of the central Asian republic's mission in Islamabad, was found lying in a pool of blood at his house in the capital on Wednesday with a single gunshot wound to the head. He died at hospital on Friday. "We arrested two suspects from Islamabad and the nearby city of Rawalpindi on Friday," police investigator Bashir Noon told AFP. Noon said two other suspects were to be rounded up over shortly.Police had no immediate clues about a motive of the killers, but they have said there were no signs of a break-in. The diplomat was found sprawled on his sofa with critical head injuries on Wednesday by a servant who entered the house when he could not rouse his employer. Empty bottles of liquor and four partly-eaten hamburgers were discovered lying near Aubakirov, as well as a single empty bullet casing, police have said. The weapon used in the shooting has not been recovered, police added. Aubakirov's car, which had special red diplomatic registration plates, was also missing from the driveway of his bungalow in a leafy, exclusive area of Islamabad.