A lawyer for the families yesterday said a complaint was handed to the federal attorney general's office after the parents discovered several new pieces of evidence to contradict previous conclusions that it was an accident.
The parents allege that the fire was intentionally set in a warehouse rented by the Sonora state government's treasury department to get rid of documents related to an USD 800 million state debt, said the attorney, Gabriel Alvarado.
"We knew it from the beginning. This is the pain and struggle that we have been going through until now because we knew in our hearts that it was intentional," a tearful Ofelia Vazquez, whose son German Paul died at the age of four, told AFP at the presentation of a documentary on the tragedy.
The official investigation concluded that the fire started when the air conditioning overheated in the paper-filled warehouse in Hermosillo, the capital of the northwestern state.
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The bodyguard was found dead with nine bullet wounds two months after the fire, Alvarado said.
A spokesman for the attorney general's office confirmed that it had received the complaint and said the evidence provided by the families would be examined to determine whether it warrants an investigation.
Authorities have investigated 28 officials for negligence in the case, but all remain free on bail.