WASHINGTON, Oct. 14—The Sipsah, an 8,000‐ton Pakistani ship, has recently unloaded crates of North Korean small arms and ammunition at Karachi, well informed sources re ported here today.

The vessel arrived at Karachi Sept. 18 from the port of Hungnam in North Korea, the sources said.

They also reported that Pakistan and North Korea had signed agreements for the opening of consulates in each other's countries. North Korea is about to open a consulate in Dacca, the provincial capital of East Pakistan, they said.

Build‐Ups Stir Concern

Meanwhile, the State Department expressed concern today over reports of increasing troop build‐ups on both sides of the Indian‐Pakistani border. It said that it had been urging restraint on both the Indian and Pakistani Governments.

But Robert J. McCloskey, the State Department spokesman, denied reports from Pakistan that the United States had offered to mediate in the civil war between West and East Pakistan. He said that the United States had urged the Pakistani Government to seek political reconciliation.

On March 25, the Pakistani army moved to quell a movement for political autonomy in East Pakistan, separated from the west by 1,000 miles of Indian territory. East Pakistan has since been torn by civil war and millions of refugees have crossed into India, causing serious tension between the two Governments.

The reported arms delivery to Pakistan was the first from North Korea that officials here could recall. They said it was unclear whether the shipment was the result of a commercial sale or a governmental transaction between Pakistan and Communist North Korea.

Pakistan is a member of the Central Treaty Organization with the United States and has received $2‐billion in arms from the United States since 1954, officials said.

Some officials here suggested that the Soviet Union, which recently signed a treaty of friendship with India, might be seeking to maintain friendly links with Pakistan as well by furnishing arms through North Korea. These officials stressed that the Soviet Union and North Korea closely coordinated their activities.

One official said: “Last March, 19 students arrested by the Mexican authorities for plotting against the Government admitted that they had attended Patrice Lumumba University in Moscow and then had gone on to North Korea for training in subversion. In April, students involved in the rioting, in Ceylon were found to have been in Moscow and later to have gone on to North Korea.”

Other well‐informed sources discounted, however, the suggestion that the Soviet Union might have inspired the North Korean arms deal and the consular agreement with Pakistan.

They suggested that China was a more likely source of the arms.

“The Communist Chinese have been cozying up to the North Koreans lately,” one source commented. “This would fit in with China's standing policy of supplying arms to Pakistan — but without publicity.”