(CNN) The United Nations Human Rights Council has voted to investigate the thousands of killings in the Philippines tied to President Rodrigo Duterte's ongoing war on drugs, a move which the country's foreign minister quickly denounced as unjust.

The resolution was put forward by Iceland at the Human Rights Council in Geneva Thursday and passed with 18 votes. Fifteen countries abstained, and 14 voted against it.

International human rights groups and UN bodies have previously expressed concerns about the Duterte administration's scorched earth-approach in its efforts to eradicate the methamphetamine trade.

The Philippines Secretary of Foreign Affairs, Teodoro L. Locsin Jr., said the UN Human Rights Council's decision Thursday "flies in the face of everything the Philippines has worked for when it founded the Human Rights Council." The council was formed in 2006 by a UN general assembly resolution.

"We will not accept a politically partisan and one-sided resolution, so detached from the truth on the ground. It comes straight from the mouth of the Queen in Alice in Wonderland, 'First the judgment, then the proof,'" Locsin said in a statement.