New Delhi, Nov. 14 -- A 450-page charge sheet filed by Delhi Police in the gangrape of a 17-year-old girl inside south Delhi's Aastha Kunj Park in September details how three men posing as policemen allegedly threatened the teenager and her male friend, separated them and sexually assaulted her at knifepoint. The charge sheet, a copy of which HT has accessed, was filed on Friday. It names Md Asif, Hemant Singh and Mukesh Singh as accused and records the statements of 57 witnesses. According to the document, CCTV footage from the park and nearby areas showed the three men roaming around the park on multiple occasions, including on the evening of September 21, when the incident took place. The teenager, who was celebrating her birthday with h...