At least 20 Mexico state officials are under investigation in the cover-up of threats and torture for witnesses to alleged extrajudicial killings by soldiers last year, state authorities said on Wednesday. State attorney for Mexico state, Alejandro Gomez, said the officials under investigation include prosecutors, forensic investigators and state police. On June 30, soldiers killed 22 alleged gang members at a warehouse in Tlatlaya. The army first said they died during a shootout, but it was discovered that some were executed. Federal investigators have said eight people were killed after surrendering to the soldiers, but the National Human Rights Commission put the number between 12 and 15. The commission also said the state attorney’s office tried to cover up the torture and sexual threats endured by at least two of the three women who survived. “None have been removed from duty yet because there is a presumption of innocence,” Gomez said at a news conference. He said it was not clear when a determination would be made about the officials’ involvement. In a recent interview, one of the witnesses described the torture she suffered. She said that when she refused to sign a false statement that all 22 had died in a shootout with soldiers, state officials kicked her in the ribs, shoved her head into a toilet and hit her on the head. Judicial documents indicate state authorities knew from the beginning soldiers had altered the crime scene. Gomez said on Wednesday his office is working to implement recommendations made by the human rights commission, including training employees about preserving evidence and respecting human rights as well as compensating the three survivors. The amount to compensate the witnesses will be determined once the investigation is concluded, Gomez said. The Tlatlaya case, along with the disappearance and presumed slaying of 43 students from a rural teachers college in the southern state of Guerrero, have triggered widespread criticism across Mexico about human rights abuses.