The contract entered into force on 8 August 1973 and ended on 1 July 1974. As part of the agreement, UNHCR monitored the repatriation of citizens from Bangladesh and Pakistan. According to the UN, 121,695 Bengals have been relocated from Pakistan to Bangladesh. These included senior Bengali officials and military officers. 108,744 non-Bengali civilians and civil servants were transferred from Bangladesh to Pakistan.  India released 6500 Pakistani prisoners, most of them transported by train to Pakistan.  In 1974, General Niazi was the last Pakistani officer to be symbolically returned across the Wagah border.  The Delhi Agreement was a trilateral agreement signed on August 28, 1973 between India, Pakistan and Bangladesh. and has been ratified only by India and Pakistan.  It allowed the repatriation of prisoners of war and interned officials detained in the three countries after the Bangladesh Liberation War in 1971. The deal has been criticized because Pakistan failed to bring Urdu spokesmen back to Bangladesh and did not hold accountable 195 senior military officials accused of violating behavior during the war.
 Although the agreement required the repatriation of the Urdu-speaking Biharis to Bangladesh, the Pakistani government withdrew its promise to establish the Community in Pakistan.  This is where the stranded stateless Pakistani community in Bangladesh was born. Among the prisoners of war, 195 Pakistani military officers detained in India were identified as the main suspects of war crimes. Pakistan insisted that they be released as one of its main demands. It urged several Muslim countries to hold back bangladesh`s recognition until the 195 officers were released.  India supported his repatriation to Pakistan. In the text of the agreement, Kamal Hossain, Bangladesh`s foreign minister, said President Zulfikar Ali Bhutto threatened to bring to justice interned Bengali officials if Bangladesh pursues plans to indict alleged Pakistani war criminals.  During the 1971 Bangladesh War, thousands of Bengali bureaucrats and soldiers were interned with their families by the Pakistani government in western Pakistan. In Bangladesh, many people in the Urdu community wanted to move to Pakistan. India detained several thousand Pakistani prisoners of war after Pakistan`s surrender on December 16, 1971, including 195 military officers detained for misconduct. Pakistan`s refusal to bring stateless Urdu spokesmen back to Bangladesh remains an important sensitive issue in Bangladesh-Pakistan relations.
the excesses and multiple crimes committed by these prisoners of war constituted, in accordance with the relevant provisions of UNITED Nations General Assembly resolutions and international law, war crimes, crimes against humanity and genocide, and there was a general consensus that persons accused of such crimes, as 195 Pakistani prisoners of war, were brought to justice and a Pakistani prisoner of war was entitled to do so. Judicial proceedings should be subject to judicial proceedings.  The treaty was signed by the foreign ministers of India, Pakistan and Bangladesh in New Delhi under the Simla Agreement.  Pakistan withdrew Bangladesh`s request to hold the trial of war crimes suspects. . . .