DAVOS, Switzerland -- Friday's mass shooting at a school in La Loche, Sask., is casting a shadow over Prime Minister Justin Trudeau's final day at an international summit of financial and economic elites.

The shooting was the first thing Trudeau talked about with Lebanese Prime Minister Tammam Salam during their meeting Saturday morning at the World Economic Forum in Davos, Switzerland.

The RCMP confirmed that four people were killed, a number of others were wounded, and that a lone male suspect was arrested after shots rang out at the Dene community's junior and senior high school.

Trudeau told Salam the tragedy has seen Canadians pull together yet again for a community needing support. The prime minister added that the question now is how to prevent such tragedies from reoccurring

Salam lamented that these kinds of shootings are happening everywhere -- "as if they have become the fashion."