Federal government documents in Australia show officials in the Department of the Prime Minister warned of an extreme risk of death or injury from an insulation scheme that has now been scrapped.
The assessments warn botched insulations carry an extreme risk of fire or death.
The ABC reports the reports were prepared last July, September and October by officials from the Prime Minister's Department, the Environment Department and other agencies, before the first of four deaths linked to the scheme.
A Senate inquiry has received the documents after pressure from the Opposition.
Opposition environment spokesperson Greg Hunt says the Government tried to cover up the warnings.
A government spokesperson says the prime minister never saw the documents.