Fears of possible serial killer activity have grown in South Africa after the discovery of the body of a tenth woman. South African police confirmed on Saturday that another woman's body was found near Johannesburg, raising the total number of victims in the ongoing series of killings to 10. The investigation began after three women's bodies were found in July and August within approximately 4.3 miles of each other in the Ekurhuleni municipality, east of Johannesburg. Earlier this month, six bodies were discovered in Ekurhuleni over a 10-day period, heightening concerns that a serial killer or killers might be involved. Two women were arrested and charged last week with murder in connection to the ninth body, which was found on September 17. The victim had been stabbed and had her throat cut, according to police. However, the two women charged were not linked to any of the other killings. Provincial police commissioner Lt. Gen. Tommy Mthombeni told the state broadcaster SABC that investigators believed the ninth killing might be an isolated case, but they could not rule out the possibility that some of the other cases were connected. Police have issued warnings for women to be cautious in the area, noting similarities in some of the killings but stating they have not found conclusive evidence linking them to the same person or group. All nine bodies discovered before Saturday were those of women in their 20s or 30s, police said. Several were found naked or partially clothed and left in open areas near main roads. The Investigative Psychology Unit, which specializes in complex or serial violent crimes, is part of the ongoing investigation. Limited details were released about the 10th body, which was found early Saturday. The victim was identified by a friend who had been with her at a bar the previous evening. The local police commissioner noted that while the force could not rule out the possibility of a serial killer, there were similarities across the 10 deaths in Ekurhuleni and another in Soweto. The latest body was discovered at a cemetery in the Tembisa neighborhood, northeast of central Johannesburg. Police confirmed that crime scene investigators were at the scene collecting evidence. The woman's friend told the national broadcaster SABC that she recognized her friend's clothes from the previous night when shown a picture of the body. "I don't know what I'm going to say to her children," she said, wiping away tears. "It's painful." Gauteng Police Commissioner Tommy Mthombeni said it was too early to determine whether the latest death was connected to the others. He noted that the victims shared a "similar victimology" that indicated a shared "modus operandi" of killing, which could help police determine if the deaths were linked. South Africa has one of the highest homicide rates in the world, with 5,427 people murdered between April and June this year alone. The recent killings around Johannesburg have left many women in the area deeply concerned, especially as the 10 bodies have been found in similar circumstances since July. Most were found in Kempton Park, a neighborhood near Tembisa, and many of the victims were young women who had suffered extreme violence before their deaths. The deaths have added pressure on the national government, less than a year after ministers declared gender-based violence a national disaster.