What are the details?
In a briefing, Trudeau said, "These weapons were designed for one purpose and one purpose only: To kill the largest number of people in the shortest amount of time. There is no use and no place for such weapons in Canada."
At least 1,500 models of "military-grade" assault weapons have been banned by the new order, ABC News reported.
"It is no longer permitted to buy, sell, transport, import, or use military-grade assault weapons in this country," Trudeau added.
The Canadian prime minister added that it is important to tighten up gun controls around the country, especially following the killing that took place across Nova Scotia.
"We have long committed to strengthening gun control in this country, including banning military-style assault weapons," he added. "There is no need in Canada for guns designed to kill the largest amount of people, in the shortest amount of time."
He pointed out that a "large consensus" of Canadian citizens wants to see "less violence and fewer deaths from gun violence" in the country.
Public Safety Minister Bill Blair voiced his support for the new order, saying, "As of today, the market for assault weapons in Canada is closed."
He added, "Enough is enough — banning these firearms will save Canadian lives."
Reports say that a two-year amnesty period for legal owners of such weapons will be available in order to bring them into compliance. He also pointed out that new legislation would be forthcoming in order to provide "fair compensation" to those owners.
Trudeau added, "You don't need an AR-15 to bring down a deer."
You can read more about the deadly mass killing that shook the nation here.