Many mass graves have been discovered in Bangladesh. The first night of war on Bengalis, which is documented in telegrams from the American Consulate in Dacca to the United States State Department, saw indiscriminate killings of students of Dacca University and other civilians. Numerous women were tortured, raped and killed during the war; the exact numbers are not known and are a subject of debate. The widespread rape of Bangladeshi women led to birth of thousands of war babies. The Pakistan Army also kept numerous Bengali women as sex-slaves inside the Dacca Cantonment. Most of the girls were captured from Dacca University and private homes. There was significant sectarian violence not only perpetrated and encouraged by the Pakistani army, but also by Bengali nationalists against non-Bengali minorities, especially Biharis. In June 1971, Bihari representatives stated that 500,000 Biharis were killed by Bengalis. R. J. Rummel gives a prudent estimate of 150,000 killed.