Mexico Heaven Bar disappearance: More bodies identified 26 August 2013 Last updated at 10:15 Forensic experts have identified the bodies of five more youths who had gone missing after visiting a bar in a popular entertainment district in Mexico City. Police found 13 bodies in a mass grave on a ranch near the capital on Thursday. Ten of them have now been identified as those of the youths who disappeared from Mexico City's Heaven bar in May. The motive behind their disappearance and subsequent killing remains unclear. Mystery disappearance Seven young men and five women ranging between 16 and 34 years of age were reported missing in the days after the group went to the bar in the Zona Rosa district on 26 May. Surveillance footage showed some of them being led to cars outside the after-hours bar. There was no trace of the youths until their bodies were discovered in a grave covered with lime, cement and asbestos on the outskirts of Mexico City. All of the youths come from the rough Tepito neighbourhood of Mexico City, and local media have speculated that their killing could be related to warfare between local crime gangs in the area. Three of the youths are related to convicted crime bosses, but their relatives have denied the youngsters were involved in illegal activities. Mass kidnappings carried out by drug cartels are not unusual in the border areas of Mexico, but the case of the 12, who disappeared in broad daylight on a Sunday morning from the centre of the capital shocked residents. Two co-owners of the Heaven bar and two employees who were working on the night of the incident have been arrested in connection with the case. Another co-owner, Dax Rodriguez Ledesma, was found burned to death in July. Police had been searching for him at the time of his killing. Official figures say 26,000 people have gone missing across Mexico since December 2006, when the army was deployed to fight crime gangs. Amnesty International has accused the Mexican government was not doing enough to investigate the disappearances of thousands of people.