KARACHI, Pakistan, Oct. 25 —The Government reported to‐ night that its forces had killed 501 “enemy troops”—defined as “Indians and Indian agents” —in heavy fighting in East Pakistan.

The Government, here in Pakistan's western wing, uses the term “Indian agents” to refer to all of its adversaries in East Pakistan, including the Pakistanis there who have been battling for Bengali independence since March with Indian support.

U.N. Observers Suggested

Today the Government said some of the bodies bore identification tags of the Indian Army. If the casualties are in deed Indians and if the toll even approaches the figures given, that would indicate that the fighting had reached its greatest intensity since the brief Indian‐Pakistani conflict in 1965.

[In New Delhi, Defense Minister Jagjivan Ram reiterated that India would not pull her troops back from her borders “as long as the Pakistani threat continues.” Page 17.]

Meanwhile, the Government announced that President Agha Mohammad Yahya Khan had asked for the intercession of Secretary General Thant of the United Nations in the dispute.

According to the Pakistani radio, President Yahya Khan proposed that United Nations observers be posted on both sides of the border between East Pakistan and India to supervise a mutual withdrawal of forces to an agreed distance. He had previously proposed such a withdrawal to India, which rejected it.

He suggested that troops and armor be withdrawn by both sides to “peacetime positions,” implying for the first time that India and Pakistan are in a state of war. If such a withdrawal is not possible, he added, a withdrawal should be made to positions affording security to both nations.

‘Indians and Indian Agents'

In a communiqué, Pakistan said that the latest casualties among “Indians and Indian agents” numbered 438 yester day and 63 today. The communiqué did not mention Pakistani military casualties but said that Indian shelling of seven East Pakistani villages had cost the lives of 67 persons.

The Pakistani leader's request for the intercession of Secretary General Thant was made in a letter he sent Thursday in response to one he had received from Mr. Thant.

President Yahya Khan said that an immediate visit to the area of confrontation by Mr. Thant would yield “useful results.”

He reiterated Pakistani charges that border tensions had been caused by Indian aggressive designs and said that an Indian statement last Tues day had threatened the capture of the Pakistani cities of Lahore and Syalkot, “proving the gravity of the situation.”

Meanwhile, the Government said the army had beaten back an attack by Indian troops and guerrillas on the Pakistani border post of Kamalpur, in Mymensingh District.