Justin Trudeau, Canada’s prime minister, wore brownface makeup to a party at the private school where he was teaching in the spring of 2001. TIME has obtained a photograph of the incident.

The photograph has not been previously reported. The picture was taken at an “Arabian Nights”-themed gala. It shows Trudeau, then the 29-year-old son of the late former Prime Minister Pierre Trudeau, wearing a turban and robes with his face, neck and hands completely darkened. The photograph appears in the 2000-2001 yearbook of West Point Grey Academy, a private day school where Trudeau was a teacher.

Earlier this month, TIME obtained a copy of the yearbook, The View, with the photograph of Trudeau in brownface from Vancouver businessman Michael Adamson, who was part of the West Point Grey Academy community. Adamson was not at the party, which was attended by school faculty, administrators and parents of students. He said that he first saw the photograph in July and felt it should be made public.

On Wednesday, Zita Astravas, the media relations lead of the Liberal Party of Canada, which Trudeau is the leader of, confirmed that the Prime Minister was in the photo. “It was a photo taken while he was teaching in Vancouver, at the school’s annual dinner which had a costume theme of ‘Arabian Nights.’ He attended with friends and colleagues dressed as a character from Aladdin,” said Astravas. Trudeau is planning on addressing the photograph to the media later this evening, according to the Astravas. The prime minister’s official director of communications did not return multiple calls.