being sought by Interpol , the 188-nation worldwide police agency , the prosecutor said . He declined to reveal their identities . Sanz Quiroz acknowledged the uniqueness of the allegations . `` We are not making this up , '' he said . `` They have confessed to this . That 's what 's coming out now . '' One of the suspects told officials he had been committing the murders for five years . According to a criminal complaint Sanz Quiroz filed November 18 , officials discovered on September 22 a small container containing a fat-like substance that had been stored at the Bella Durmiente bus station in Lima , Peru 's capital . On November 3 , the complaint says , suspect Serapio Marcos Veramendi Principe was arrested after he retrieved three bottles from the Estrella Polar bus station . The bottles contained a substance authorities believe is human fat , the complaint says . Lab tests are being performed to determine what the substance is . Authorities identified the three other suspects as Elmer Segundo Castillejos Aguero , Hilario Cudena Simon and Enedina Estela Claudio . The suspects identified each other for police in photo lineups ,
-LRB- CNN -RRB- -- Peruvian authorities say they have arrested four members of a gang that specialized in selling to European labs fat obtained from dead humans . Officials are investigating the disappearance of at least 60 people they believe were killed by gang members in two mountainous states in central Peru , lead prosecutor Jorge Sanz Quiroz said Friday . The four suspects have been charged with murder in the September slaying of a Peruvian man , the prosecutor said . `` They killed to obtain human fat because there were European laboratories that would pay them , '' Sanz Quiroz said . The suspects told authorities they were paid $ 15,000 for a liter -LRB- about 1 quart -RRB- of human fat . Officials did not disclose what possible use laboratories could have for the human fat , but fat can be a component of cosmetics and is used in reconstructive or cosmetic surgery . The use of human fat for any purpose is extremely rare , however , physicians say . Other suspects , including the Peruvian ringleader , have eluded capture , Sanz Quiroz said . Authorities have the names of two Italian suspects who are