Two suspects in the recent gang rape and murder of a Hyderabad veterinarian confessed to nine similar crimes while in police custody.
Lorry workers Mohammed Arif, 26, and Chintakunta Chennakesavulu, 20, were among the four suspects killed in a reported escape attempt earlier this month.
Police sources said the two men confessed to raping, murdering and burning three other victims in three different Telangana districts.
Investigators now believe the duo were involved in as many as 15 cases and are now looking into all cases in which charred bodies of women were found near highways.