Erwin Alvarez, of the opposition Parliamentary Front for Transparency, filed the complaint against Sergio Cabanas, head of disaster management agency CONRED, for manslaughter and breach of duty.
![The flood forced the Kenyan to stay on the tree for days [Kenya Red Cross]](data:image/svg+xml;charset=utf8,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20width%3D'100'%20height%3D'100'%20data-ring-placeholder%3D'1'%3E%3C%2Fsvg%3E "The flood forced the Kenyan to stay on the tree for days [Kenya Red Cross]")
He told reporters that Cabanas and others had failed "to order the evacuation of surrounding communities" on June 3 as the volcano erupted.
He said the civil protection authority "did not take account in a timely manner" the warnings issued by the Institute of Volcanology about the intensity of the eruption.
Officials have confirmed the deaths of 112 people, but scores more remain unaccounted for. Thousands were left homeless.
The prosecutor's office is already working on a separate investigation over alleged negligence.
CONRED spokesman David de Leon said the agency was cooperating with the investigation.
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