This is the best summary I could come up with:

Conservative Leader Pierre Poilievre says he was relying on media reports in the House of Commons when he referred to Wednesday's explosion on the Rainbow Bridge in Niagara Falls as a "terrorist attack."

When a serious incident occurs, it's customary for the Official Opposition leader to ask the prime minister for the latest update at the beginning of question period.

On Wednesday afternoon, Poilievre asked Prime Minister Justin Trudeau to update the House on the situation at the Rainbow Bridge.

A number of American news outlets had begun reporting the incident as a terrorist attack before CTV's article was published.

The Liberals, who have been trailing Poilievre's Conservatives in the polls recently, seized on the moment to accuse the Tory leader of not taking responsibility.

Pierre-Yves Bourduas, a former deputy commissioner of the RCMP who now runs a public safety management company, said Poilievre's statement in the House was "regrettable."

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