New Delhi, Sept. 18 -- A 16-year-old girl was allegedly gang-raped and murdered by a group of four teenagers - three of them minors - who dumped her body in a field in outer Delhi's Swaroop Nagar, police said on Thursday. Officials said that all accused are in custody - a 19-year-old man had been arrested, while three minors were apprehended. Investigators said one of the accused, a 17-year-old boy, appeared to be the victim's "friend" and that she had gone to meet him. The other three accused, police said, were friends of the 17-year-old. At least two investigators familiar with the case, who asked not to be identified, told HT that the crime appears to have taken place on Friday. The girl's body was found in a highly decomposed state on Sunday morning. Police said they received information on Sunday morning about a body lying in a field near Kushak Road in Swaroop Nagar. The body was mutilated, with the right hand missing and the face and abdomen disfigured by decomposition. "The face was not recognisable. The medical report confirmed rape and we found eight wounds on her body... " said the first investigating officer. Based on the family's statement and post-mortem findings, police registered a case of murder, rape and causing disappearance of evidence. A team led by additional DCP (outer north) Lokeshwaran R and ACP Ravinder Ahlawat began investigating and more than 50 CCTV cameras in the area were scanned. During the exercise, they spotted a tempo moving near the location around the suspected time of the crime. Police picked up its driver for questioning, who told them that his younger brother, 17, frequently used the vehicle. "The footage also revealed the presence of four young boys inside the tempo. The boys were soon identified but had fled from their homes," an investigator, aware of the case said. The accused were identified as Shivam Ganesh, 19, and three minors aged 17 and 16, police said. Two police officers confirmed to HT that at least three of the accused confessed to raping the victim. A second investigator said: "The minor had gone to meet the 17-year-old on Friday night. He was the first to rape her, after which she threatened to report the crime. He then called his friends who overpowered her and raped her. They were all under the influence of alcohol." "After the rape, they took her to a field and stabbed her more than six times. They tried to hide the body under leaves and mud. They later fled in the tempo. We are investigating whether the rape took place inside the vehicle or at the field," the officer added. Police said the girl was a school dropout who had moved to Swaroop Nagar a few years ago. She was looking for a job to support her parents and was living separately from them. No missing-person complaint had been filed because her parents were unaware that she had gone out and had been missing for two days, police said....