The agency did not immediately respond to a request for comment about the allegations nor to a request to speak with González.
A video from a security camera inside the Ciudad Juarez facility showed guards walking away when the fire started late Monday inside the cell holding the migrants and not making any attempt to release them. It was not clear whether those guards had keys to the cell doors.
Lawyer Jorge Vázquez Campbell, who filed the complaint, said he would not reveal his clients’ identities for their protection, beyond saying they were connected to the case.
The formal allegation came as Mexican authorities announced Wednesday that eight suspects who worked at the facility were under investigation, as well as one migrant accused of starting the fire. Authorities said the possible charges — which have not been filed yet — could include homicide and causing injuries.
Sara Irene Herrerías, the prosecutor leading the investigation, said that González was not one of the eight officials called in to give statements about the incident.
Five of the officials being investigated are contracted security guards from a private firm, two are officials from the National Immigration Institute and one is a Chihuahua state official.
The government said it was preparing to request at least four arrest orders related to the case.
Campbell said his clients told him that one of the detained migrants asked a guard for a cigarette and a lighter and then five migrants who had been detained that day began to protest.
“The officials made fun of them, they got irritated, and two of them (migrants) set a mattress on fire,” Campbell said.
That was the moment, Campbell said, that immigration agents at the facility notified González of the fire and he “told them not to do anything and under no circumstances should they let them leave.”
Herrerías said prosecutors have not yet seen any evidence such a call was made, but investigations are ongoing.
Authorities in the region have known that foam mattresses in such facilities are easily set alight and can cause massive smoke clouds, ever since a similar fire at a state-run home for troubled youths in Guatemala killed 41 girls in 2017.
Mexico’s immigration detention centers have been plagued for years by accusations of corruption and bad conditions.
The circumstances of the fire have angered families across the region who were still awaiting confirmation of whether their loved ones were dead or alive.
Late Wednesday, hundreds of migrants walked across the border in Ciudad Juarez in protest and turned themselves over to U.S. authorities.
Mexico President Andrés Manuel López Obrador said Thursday that he had told the attorney general to not give anyone special consideration and that impunity would not be permitted.
