A mystery remains after DNA tests conducted on charred bodies didn’t match five missing Mexican students who had been kidnapped by a cartel.

Roberto Olmeda, Diego Lara, Uriel Galván, Dante Cedillo and Jaime Martínez, all aged between 19 and 22, were kidnapped by the gang on August 11 in Lagos de Moreno, a city in Jalisco.

The young men were then taken to a red-bricked, roofless house where they were brutally tortured — while the gang's logo was seen plastered on the walls in the background.

READ MORE: Inside 'slaughterhouse' where cartel hitmen forced childhood friends to kill each other

A sick video emerged of the victims lying down in the dirt wearing handcuffs while one is forced to beat, stab and finally decapitate his childhood pal.

Further footage surfaced showing another tag reading “a slaughtering is the best medicine,” written on a wall in black paint.

Just days later, on August 16, authorities raided the dilapidated home to find the burned bodies of five victims.

Despite strong suspicions the bodies belonged to the missing students, brand new results from DNA testing revealed that it wasn’t the missing men in question.

“There are already factors to say that these, at least, do not correspond to young adults,” Governor Enrique Alfaro said in a press conference on Tuesday.

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“We even already talked with the parents, but as we have always done, the details will be provided by the Attorney General's Office, but I could anticipate that these bones don't correspond.”

Further human remains were extracted from another home in the area on Monday, and additional DNA testing had been scheduled, Alfaro revealed.

The five university students were reportedly kidnapped by a faction of the Jalisco New Generation Cartel (JNGC) after attending a festival honouring the city's patron saint.

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Alfaro is in no doubt that the cartel was behind the grim events, and said: “'I do not think it is necessary to expose and explain that behind this there is an issue of organised crime.”

Prior to the grisly discovery in the house, on August 15, police found a car on fire with burned bodies inside. DNA tests didn't match any of the five missing students.

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