Indigenous groups in Canada have demanded a nationwide search for further graves after the discovery of the remains of 215 children.
The Tk'emlups te Secwepemc First Nation announced last week that remains were found at a former residential school set up to assimilate indigenous people.
The find sparked outrage, prompting some in Canada to lay out tiny shoes at makeshift memorials.
Prime Minister Justin Trudeau pledged help but gave few details.
"As a dad, I can't imagine what it would feel like to have my kids taken away from me," Mr Trudeau told reporters. "And as prime minister, I am appalled by the shameful policy that stole indigenous children from their communities."
While he promised "concrete action" when asked what the government would do he did not offer specific commitments.