KARACHI, Pakistan, Sept. 15 —President Agha Mohammad Yahya Khan returned to Pakistan today after a one‐day trip to Iran, where he was said to have held secret talks of great political importance. A communiqué said only that he had discussed matters of mutual importance with the Iranian Government.

Political and diplomatic circles speculated that there would be important developments in the next few days. Local newspapers cited “informed circles,” presumably within the Government, as saying that Iran had become conference “clearing house” for Pakistan.

Iran's ruler, Shah Mohammed Riza Pahlevi, is said to have offered his help and conference facilities to all governments and political groups involved in Pakistan's various crises.

Among these is the border conflict with India that has been simmering since March when the national army began to suppress a separatist movement in East Pakistan. Shelling across the border in East Pakistan is reported daily, and last night the Pakistani Government said that 60 Indian soldiers who had crossed into the Rajshahi district in East Pakistan had been killed.

Embassies Believed Active

It is believed here that contacts between the Indians and Pakistanis have been arranged in Teheran, where the Soviet and American embassies also are believed to be encouraging peacemaking efforts.

Related to Pakistan's conflict with India is the political situation in East Pakistan. Although India has stopped short of extending diplomatic recognition to the Bengali rebels who call for an autonomous state of Bangla Desh (Bengal Nation) there, she has given them material and political support.

It is understood that contacts between President Yahya and Bengali leaders have been arranged, perhaps even including direct talks in Teheran.

The spiritual and political leader of the dissident Bengalis, Sheik Mujibur Rahman, has been a prisoner of the Pakistani Army since March 26 and on Aug. 11 he reportedly went before a court‐martial on charges of “waging war against Pakistan.”

Any political settlement in East Pakistan not involving Sheik Mujib seems to most outside observers unlikely to reduce the danger of an accelerating civil war.

But to release Sheik Mujib and tacitly admit that he was wrongly arrested seems a step that President Yahya would be unwilling and unable to take. This is presumably at the core of the current discussions.

Circles close to the Government report that the secret trial of Sheik Mujib is nearly over. President Yahya Khan is expected to address the nation in the next few days to discuss his political plans in detail, possibly including the fate of Sheik Mujib.

Pakistan is a nation where political plotting is endemic. An attempt to kill one of the President's key lieutenants today heightened speculation that one or more conspiracies may be under way.

M. M. Ahmed, economic adviser to the President, was wounded by a knife‐wielding assailant in Islamabad, the capital. The assailant was identified as the foreman of an air conditioning plant serving Government buildings. There was no immediate indication as to his motives.

According to a Government announcement, Mr. Ahmed, who holds Cabinet rank and is among the President's closest advisers, was attacked as he was about to enter an elevator in his office building. He was stabbed in the back, the announcement said, and is in satisfactory condition in a hospital.