The Wildlife Department shifted the two dead blind dolphins to Dolphin Research Institute for post- mortem.
The wildlife and the fisheries departments have so far failed to find the possible cause of the deaths of the precious specie.
Sources said that the higher authorities recently formed a probe committee, which had revealed that some fisherman threw poisonous substance into the river which is causing deaths of the endangered fish found only in two rivers Asia-Ganges and the Indus River.
The inquiry team also reported that polluted sewage drained out into the river was another reason.
Local people are concerned over failure of the authorities in taking precautionary measures for conservation of the precious specie.