WASHINGTON, June 2— The United States was reported today to be planning to contribute $10‐million to $15‐million more to care for East Pakistani refugees fleeing into India.

In addition, reliable sources said today, four C‐130 trans ports at Pope Air Force Base, near Fayetteville, N. C., are awaiting orders to fly to India to help move up to 50,000 refugees from the overcrowded Tripura area on the East Pakistani‐Indian border area to camps in Assam, in extreme northeast India.

The airlift is expected to cost $750,000 and require a month.

Since March 25, when President Agha Mohammad Yahya Khan directed the Pakistani Army to crush a movement for political autonomy in East Pakistan, refugees—both East Pakistani Hindus and Bengali Moslems—have been pouring into India at a rate estimated at 50,000 or more daily. India last month said that the total exceeded three million; it may now be four million.

U. S. to Pay Half

The new financing and the airlift reflect a recent White House decision to underwrite up to half of the over‐all cost of caring for the refugees for the next 90 days. Two weeks ago President Nixon authorized $2.5‐million for relief to be distributed through voluntary agencies already operating in India, such as CARE, Catholic Relief Services and Church World Service‐Lutheran World Federation. A half‐million dollars in cash from this fund was immediately turned over to the United Nations High Commission for Refugees.

The total cost of feeding the Pakistani refugees in India for 90 days has been estimated by the Indian Government, by the United States Agency for Inter national Development and by United Nations agencies at a minimum of $30‐million.

The $2.5‐million and the $10‐ million to $15‐million expected shortly would make up the United States half‐share.

Meanwhile, the Agency for International Development is reported to have questioned the Pakistani Government about the apparent seizure by the Pakistani Army of 50 United States military boats sent to East Pakistan last winter to help distribute supplies to cyclone victims.

Photos of Boats Reported

According to responsible sources, photographs have appeared in Pakistan showing Pakistani troops using the vessels to ferry troops up East Pakistani waterways.

Three million Pakistani refugees are estimated to be in the Calcutta area, with the remainder scattered along the frontier. It is estimated that 500,000 are in the Tripura area, due east of Dacca. It is principally here that shortages of food, clothing, shelter and medical supplies, the threat of cholera and poor communications have caused India her greatest problem.

The United States pledge of four C‐130's is a response to an Indian request to the United Nations six weeks ago for international assistance.