KARACHI, April 16 — The Government radio said tonight that Pakistani troops had prevented saboteurs from blowing up two power stations in East Pakistan.

The radio said that “Indian infiltrators and antistate elements” were involved and were trying to cripple the East Pakistani economy.

The report came after an account yesterday of an attempt to blow up a bridge near Dacca and indicated that a systematic campaign of sabotage was being mounted in East Pakistan, where the army has been trying to crush the nationalist movement.

Speedboats Reported Sunk

The plants said to be involved were the Ashuganj thermal power station which is on the Meghna River 35 miles northeast of Dacca and the Kaptai hydroelectric power station on the Karnaphuli River 30 miles east‐northeast of Chittagong.

The Government radio said that three speedboats used by the saboteurs making the attempt on the Ashuganj plant had been sunk in an engagement in the Meghna River.

The saboteurs had suffered heavy casualties it said and large supplies of ammunition had been seized.

The radio also reported that the saboteurs who had attempted to blow up the Kaptai plant had been “wiped out.” The plant, it said was not damaged.

Indian Charges Denied

As has become customary, the radio also denied specific Indian charges against Pakistan. This evening it denied that the Pakistani Air Force had bombed a school in Jessore and that Pakistani troops had fired into Indian territory.

The charges, it said, were “nothing but an excuse for India to intervene directly in Pakistani affairs.”