KARACHI, Pakistan, Sept. 16 —Persons close to the Pakistani Government said today that Pakistan was making a final effort to improve relations with India, Iran, it was said, would play an important role as intermediary. President Agha Mohammad Yahya Khan returned here yesterday after a one‐day trip to Iran In which he held talks with the Iranian ruler, Shah Mohammed Riza Pahlavi. Pakistan and neighboring Iran, both Moslem nations, are close diplomatic friends.

Political informants say that President Yahya went to Iran mainly to explore the possibilities of reducing tensions between Pakistan and India, and to renew a Pakistani initiative toward a summit meeting be tween himself and Prime Minister Indira Gandhi of India.

Relay Role for Shah

It was speculated in political circles that if such a meeting were to take place, it would probably be in Colombo, Ceylon, whose Prime Minister, Mrs. Sirimavo Bandaranaike, has repeatedly offered her good offices in negotiations. In the past, Mrs. Gandhi has declined to meet with President Yahya.

The Pakistan — Iranian talks were reportedly intended to inform the Shah of Pakistan's intentions in resolving the problems of war‐torn East Pakistan. Iran's diplomatic service would presumably relay these intentions to India and, ultimately, to leaders of the Bengali separatists in East Pakistan.

Pakistani Government sources made it known through local newspapers that current Pakistani initiatives toward peace are in the nature of an eleventh hour effort.

The Karachi Evening Star stated: “This major step taken in the interest of peace will be decidedly the last if there is no positive response from the Indian side.”

The newspaper quoted a Government source as saying that the situation on the border be tween East Pakistan and the Indian State of West Bengal has become “almost unbearable” and that if Indian shelling in that region does not stop, “something drastic will have to be done about it soon.”