UNITED NATIONS, N. Y., Oct. 5—Pakistan's chief delegate to the United Nations, Mahmud Ali, said today that India had been carrying on a clandestine war against Pakistan “for the past few months,” chiefly since violence erupted in East Pakistan in March.

Speaking in the General Assembly, Mr. Ali said that Pakistan was willing to accept United Nations border observers, an idea that has been rejected by India.

Samar Sen of India, using the right of reply, rejected Mr. Ali's statements and asserted that “in fact, it is Pakistan that has been shelling us.”

He asserted that Pakistan had failed to keep “many promises” to her people and was paying the price in rebellion.

Most press reports from East Pakistan have described violence by Pakistani Government troops against the people of East Pakistan in putting down an attempt at secession by the eastern part of the country. But Mr. Ali said that in fact India was stirring up the trouble.

“What is happening today on the borders of my country and our neighbor India is not mere border skirmishes,” he said. “It Is armed intervention by one country, a member of the United Nations—India—in the territory of another member of the United Nations—Pakistan.”

He said that, at a time when there was no conceivable fear of invasion from Pakistan, India had concentrated “some 200,000” soldiers with “machines of destruction” on their common borders.

India “has been shelling and mortar‐firing Pakistan incessantly,” said Mr. Ali. “It regularly sends its own armed personnel into my country for causing death and destruction.”

He said that Indian forces fired “nearly 1,000 shells” into five closely grouped Pakistani border villages in the Sylhet district on the night of Sept. 29, killing 28 villagers and wounding 13. He said that Indian soldiers then tried unsuccessfully to infiltrate the area.

In another move, he said, India has equipped frogmen who have been putting explosive charges on the hulls of ships carrying food to East Pakistan at Chalna and Chittagong.

He said 70 million people faced famine in East Pakistan. and that if the international community was truly concerned about their fate, “it has an obligation to prevent India from indulging in activities which, if unchecked, cannot but endanger the sustenance of the people of East Pakistan.”

Pakistan, he said has ex pressed readiness to cooperate with a committee of the Security Council to supervise the border and reduce tension, but India has refused.

Mr. Ali gave in detail the Pakistani Government's view of the situation. “The people of East and West Pakistan are brethren, joined in an imperishable state.” he said.

He defended use of force to maintain that state intact.

He said that when Pakistan was formed out of two widely divided areas of India with Moslem majorities, upon getting independence from Britain “it was an unfettered act of self‐determination on the part of each.”

Although the two parts of Pakistan, separated by 1,000; miles of Indian territory, were bound together by a common religion when the country gained independence in 1947, East Pakistanis, the majority of whom are Bengalis, are ethnically different from West Pakistanis. And although more than half the population of 137 million live in the East, West Pakistanis have traditionally dominated the country's political life.

Mr. Ali, acknowledging that “we in Pakistan have undergone a most traumatic experience” in recent months, said that Pakistanis had been brought to realize that the fragmentation and fission of our statehood, the break‐up of our unity, is and can be no more a solution for us than it is for others.”

Maintaining that in East Pakistan “only a minority wishes secession,” he said that “for months Indian war material had been steadily passing into Pakistan” across a border that is hard to patrol.

The Pakistani crisis was precipitated last March when the army moved to crush East Pakistani secessionists. The Awami League, which had pressed for autonomy and then independence, was banned and its leader, Sheik Mujibur Rahman, was arrested. In the months since, millions of East Pakistani refugees have streamed into India.

According to Mr. Ali, India has massed troops on the Pakistan border. “Faced with this threat from outside, combined with an insurgency in the country, the Government of Pakistan had no choice but to use all means to save the country from anarchy, dismemberment and inevitable Indian domination,” he said.

Mr. Ali accused India of firing in the border areas to prevent the return of refugees to East Pakistan.

On July 19, he recalled, Secretary General Thant had offered observers to both sides to help keep the peace.

“We unhesitatingly accepted this proposal,” he said, “India, however, rejected it.”

This Indian position, he said, jeopardizes the whole principle of noninterventon and while aimed at helping establishment of an independent Bengali state —Bangla Desh—risks undermining the security of all South Asia in the process.