NEW DELHI, Dec. 6—The Indian Army reported today that it was trying to draw a tightening ring around the isolated Pakistani Army forces in East Pakistan.

There was jubilation in India after Prime Minister Indira Gandhi announced diplomatic recognition of the government formed by East Pakistani leaders in revolt against the central Pakistani Government.

To Indians, the move was symbolic first step toward their goal of establishment of “friendly” government in Dacca and the end of a united and therefore dangerous Pakistan. After India's recognition of the rebel movement known as Bangla Desh (Bengal Nation), Pakistan announced that she was breaking diplomatic relations with India.

No Massive Combat Yet

In the general war between India and Pakistan that began Friday evening, the statements of official spokesmen do not indicate that the two armies are yet locked in unrelenting, massive combat. But several stiff clashes were described to day.

Real significance seemed to lie in the general strategic situation rather than in the details of the latest ground and air engagements.

The Pakistani forces in East Pakistan, believed to consist of about 70,000 troops, seemed cut off from effective support or relief from West Pakistan.

Jessore Said to Be Bypassed

India said her troops were bypassing the 5,000‐man Pakistani brigade in the town of Jessore. She may try the same tactic in other sectors and attempt to isolate Pakistani Units in pockets, which can be softened up by air attack.

The East Pakistani ports were under intermittent Indian air attack and port authorities warned neutral shipping to stay away from them or face attack.

In any case, the Indian Army said today it had captured the town of Fenny and had thus severed the road and rail link between Dacca and the main port of Chittagong.

An Indian general estimated Pakistani casualties in the East in the last 72 hours at 317 killed in action, 199 wounded and 423 captured. The main body of Pakistan troops thus seemed intact.

But, depending on the size of stockpiles, the supply problem may begin to limit Pakistani resistance efforts.

The Indians claimed to have taken many small towns as well as Fenny. The penetrations described by Indian spokesmen were on the order of 15 to 25 miles into East Pakistan in most cases, coming from east, north and west.

Advance Slowed by Terrain

No large, brigade‐size Pakistani positions are said to have fallen yet. Maj. Gen. F. F. R. Jacob, chief of staff for the Indian Eastern Command, said that considering the marshy terrain of East Pakistan, with its many rivers, the advance “has been rapid.”

In most sectors of India's border with West Pakistan there seemed to be little fighting. India claimed to have repulsed an attack at Chhamb in Jammu by two brigades of Pakistani infantry, or about 4,800 men, supported by a regiment of 45 Chinese‐built T‐59 tanks.

India said that 23 of the tanks had been destroyed and about 50 bodies of enemy soldiers had been counted on the battlefield. Other developments were:

¶India said she had destroyed, last night and today, five Pakistani jet fighters. Indian spokesmen said that Pakistani plane losses since Friday now totaled 52, while India's own plane losses were now 19. Pakistan claimed to have destroyed a total of 79 Indian aircraft. India is thought to have had slightly more than 600 combat aircraft when the hostilities started, while Pakistan was believed to have had about 270.

¶India said her forces had destroyed a total of 89 Pakistani tanks since Friday. Pakistan originally had approximately 1,000 tanks. India called her own armor losses light.

¶India asserted she had destroyed one more Pakistani F‐86 Sabre jet fighter plane in the Eastern province and reported another “probable” kill. A spokesman said this meant that Pakistan apparently had only two jet fighters still operational in East Pakistan. Before being shot down, two of the planes strafed Indian troops near Comilla. According to diplomatic information reaching India from sources in Dacca, foreigners said they saw some Indian MIG‐21's shot down and crashing in Dacca last Saturday.

Attack on U.S. Ship Denied

India denied a United States charge that she had attacked and slightly damaged an American merchant ship, the Buckeye State, in the Bay of Bengal. “No Indian plane attacked any ship in the Bay of Bengal,” an official spokesman said to night. The United States had lodged a “strong” protest to India over the incident.

The Indian spokesman acknowledged, however, that the Buckeye State had been caught in cross‐fire at Chittagong port yesterday during an Indian air and rocket attack on military installations there.

The spokesman said that the Indian Government was detaining at the port of Madras an other United States ship, the Expeditor, but that it could sail for Rangoon if its captain gave a written declaration that he was not carrying war materials for Pakistan.

According to the Calcutta agents of the American Export Isbrandsten Line, the Expeditor had 817 tons of cargo, including lubricants, a color printing plant and spare parts for auto mobiles to be unloaded at Chittagong. It also was said to have 262 tons of cargo for Madras.

Pakistan Retreat Reported

Indian spokesmen contended that about 3,000 Pakistani troops who had penetrated 14 or 15 miles into the desert terrain of western Rajasthan in India were retreating toward West Pakistan after losing most of their tanks.

It had been widely expected here that by now Pakistan would have launched a large offensive of several divisions on the western front, but apparently no such attack has come.

Pakistan has two armored divisions and eleven infantry divisions on the western border, or well over 200,000 men. Only brigade‐size attacks have been reported so far.

The Indian spokesman said that United. Nations authorities had requested permission to land a C‐130 plane at Dacca airport this morning to evacuate United Nations personnel The Indian military forces were instructed to provide “safe conduct” for the plane, but when it was approaching the Dacca airport, Pakistanis at the control tower asked it to turn back and not land, the spokesman said.

The Indian Air Force later said that the Dacca airport had been made unoperational because a Pakistani Sabre jet returning there burst into flames while landing, the spokesman added.

The pilot of the United Nations aircraft said he would return to Bangkok, the Indian spokesman said.