WASHINGTON, Dec. 2 —Diplomatic informants here said today that the $100‐million effort of the United Nations relief agency in East Pakistan is “grinding to a halt” and that the agency has abandoned 162 new trucks, bought with international relief funds, at Chittagong because of fighting in the area.

The informants said the agency had removed the rotors from the trucks’ engines to prevent seizure of the vehicles either by the Pakistani Army or by local Bengali guerrillas. Pakistani authorities in the area, the informants said, were furious about this.

The agency, is, however, still using 100 other trucks in other areas in East Pakistan.

The United Nations agency has left one staff man at Chittagong to watch over the trucks, which cost $5,000 to $10,000 each, in the hope that the fighting will die down soon and distribution of food grains and other goods may be resumed.

Agency Staff Reduced

But in recent weeks, according to trustworthy sources, the agency has reduced its operating personnel in East Pakistan by approximately three-fifths.

Secretary General Thant and Paul‐Marc Henry, Assistant Secretary General in charge of East Pakistan relief operations, have authorized their representative at Dacca to evacuate personnel whose lives are in jeopardy or whose activities are circumscribed by the fighting. The representative is William McCaw, a United States citizen with 25 years of experience in United Nations work.

Mr. McCaw is said to have slashed his staff of 107, which was building up toward a goal of 165, by 62 members of the United Nations personnel, plus four dependents who have been flown to Bangkok.

Most of the remaining United Nations personnel of 45 representing other agencies and a four‐man crew for a chartered airplane, have been pulled back to Dacca for safety. Previously, the relief agency had been gradually moving its personnel out of Dacca into 10 strategic field stations throughout East Pakistan. These stations, informants say, have been turned over to East Pakistani relief agencies.

John Kelly, an Irish national and former commando who represents Prince Sadruddin Agha Khan, the United Nations’ High Commissioner for Refugees, has reportedly ordered his four assistants out of the area. Mr. Kelly has been in charge of observing the living conditions of an estimated 48,000 refugees who have returned voluntarily from India.

Figure Put at $100‐Million

Informants say that a total of $100‐million in contributions from the United States and from 14 other international donors has been earmarked for distribution through the agency since June, when Pakistan requested world assistance. Of that total, the informants say, only “15 to 20 per cent” has actually arrived, in the form of convertible funds, food grains, trucks or chartered boats.

According to United Nations sources, American aid pledged so far is $65‐million, of which $60‐million is in the form of surplus foods, trucks and ships. However, sources in the Agency fox.: International Development point out that the United Nations does not include American relief earmarked for East Pakistan after last fall's cyclone and before the current crisis flared up on March 25. This relief, plus normal foods from other United States sources, reportedly adds more than a million tons of food grains to the relief picture.