Protesters tore down several statues at the Manitoba legislature, including a bust of Queen Elizabeth II, during a heated rally on Canada Day, venting outrage over the discovery of unmarked graves of indigenous schoolchildren.

The activists gathered near the legislative building, located in the provincial capital, Winnipeg, to protest on Thursday, at one point descending on a nearby monument to Queen Elizabeth II and yanking it to the ground.

In addition to Elizabeth, a larger statue of the late Queen Victoria was also destroyed, pulled onto its side and defaced with red spray paint as activists cheered. That toppling was captured on video, after which activists left a sign reading, “We were children once. Bring them home” on top of the century-old statue, first unveiled in 1904.

While police made one arrest after the statues were brought down, the exact circumstances remain unclear, with the CBC reporting that the man may have shown up to criticize the protesters’ actions. No other arrests were made, though police in Winnipeg say their investigation is ongoing and that further action would be taken later.

The protesters, who reportedly numbered in the hundreds, headed for the legislature as part of the ‘Every Child Matters’ rally. The event was held to protest the dark legacy of Canada’s indigenous boarding school system after the remains of hundreds of children were discovered in unmarked graves in recent weeks.

Often run by the Catholic Church, many of the schools forcibly enrolled indigenous children under government mandates, aiming to assimilate native tribes even before Canada’s confederation in 1867. Children were taken from their families and were stripped of their cultural identities to hasten ‘integration’, many dying of abuse and neglect. The fate of countless indigenous students remains unknown, however, with the grim gravesite discoveries highlighting the massive scale of the abuses.