KARACHI, Pakistan, Oct. 24 — The Pakistan Government said its forces in East Pakistan repulsed two battalion‐sized attacks today by Bengali guerrillas supported by Indian troops and artillery.

The two attacks were said to have taken place in the Comilla area near East Pakistan's eastern frontier with India. According to the Government announcement, casualties were heavy.

Daily war communiqués reporting increasing numbers of casualties have contributed in the last few weeks to fears abroad that war between Pakistan and India might be imminent.

Pakistani announcements about guerrilla actions invariably refer to the enemy as “Indian agents,” adding to confusion as to whether Indian forces or Bengali guerrillas are involved.

[In New Delhi, Indian officials said that Pakistani mortar attacks had killed five persons in Indian towns near East Pakistan's eastern border.]

The departure today of India's Prime Minister, Mrs. Indira Gandhi, on a three‐week trip to Europe and the United States was taken as a sign by some officials and diplomats here that all‐out war was probably not near.

Fighting in East Pakistan, which began last March when Pakistan forces moved to crush the autonomy movement, has increased sharply during the last month. The Pakistani Government charged that in action yesterday Indian artillery fired 1,600 shells at 11 border villages in East Pakistan and killed 59 civilians.

Shelling yesterday at Nayanpur, between Kasba and the district capital of Comilla, was said to have for the first time involved recoilless rifles, which are generally used against tanks or fortified positions.

The first of today's reported infantry actions also was said to be near Kasba. The Indian radio had said, and Pakistan denied, that the Kasba area was “liberated territory,”

With Indian and Pakistani troops massed along the borders of both West and East Pakistan, the two countries are pursuing a war of nerves.

Over the weekend, India announced that she was calling up 600,000 military reservists to augment her army of nearly one million. Special wartime taxes were also announced by New Delhi.

In a United Nations Day message to his countrymen today, Pakistan's President, Gen. Agha Mohammad Yahya Khan, charged that India was eroding the authority of the world body by flaunting the principles of noninterference in neighbors' affairs.

In Karachi, authorities announced that, beginning today, the sirens normally used during the holy fasting month of Ramadan would no longer be sounded to wake the faithful for dawn prayers. The measure appeared intended to impress the population with the possibility that the sirens might have to be used to signal an enemy attack.

Despite the continued rise of threats and maneuvers, most diplomatic observers here feel that although protracted and bloody guerrilla warfare in East Pakistan will intensify, a conventional war between Pakistan and India still seems unlikely.