Just back from a whirlwind international tour taking selfies with adoring fans, dining with Queen Elizabeth II and vowing strong action on climate change, Canada's new prime minister now faces big challenges at home, including a sluggish economy.

Justin Trudeau was cheered at summits in Paris, Turkey, Malta and the Philipines for his youthful good looks, rock star energy and bold statements on the need to slash greenhouse gas emissions and help Syrian refugees.

An operation to resettle 25,000 Syrian refugees in Canada has begun, the International Organization for Migration (IOM) said Tuesday, with 10,000 people due to depart for their new home by the end of the year.

Processing, including security checks, began at a military base in Jordan's capital Amman on Sunday, said Craig Murphy, who briefed journalists in Geneva by phone.

New Canadian Prime Minister Justin Trudeau touched down Wednesday for his first visit to Britain since his election, with meetings with his British counterpart and Queen Elizabeth II.

Trudeau flew in with his wife Sophie and children in a stopover visit on which he will meet Prime Minister David Cameron before he goes to Malta for a meeting of the Commonwealth heads of government later this week.

The Royal Canadian Mounted Police says it is investigating a bomb threat that caused a Turkish Airlines flight from New York City to Istanbul to divert and land in Canada.

Halifax Stanfield International Airport said on its Twitter feed early Sunday that Flight 2 had landed safely and that police were at the scene.

Canada's freshly elected Prime Minister Justin Trudeau vowed to remain a "strong" partner in the fight against the Islamic State group Thursday, during a first formal meeting with President Barack Obama.

The two men joked about greying hair and traded compliments about their spouses and kids, even as Trudeau said he would not reconsider a decision to pull Canadian jets out of Iraq and Syria.

Canada's new Prime Minister Justin Trudeau promised big changes after nearly a decade of Conservative rule as he was sworn into office Wednesday, almost 50 years after his father took the job.

The 43-year-old former bartender led his Liberal party to a landslide victory on October 19, dealing a crushing blow to Stephen Harper's Conservatives. He is the second-youngest prime minister in Canadian history.

Canada's prime minister-elect Justin Trudeau said Tuesday he told U.S. President Barack Obama that Canadian fighter jets would withdraw from fighting the Islamic State group in Iraq and Syria.

But he gave no timeline.

Justin Trudeau, the first-born son of late Canadian prime minister Pierre Trudeau, won his first mandate Monday as his Liberals -- who governed most of the last century -- rebounded from a major defeat at the polls in 2011.

The former French teacher overcame campaign attack ads claiming he was "just not ready" to lead, winning the election by a landslide.

Canada's Liberal leader Justin Trudeau, son of a popular former prime minister, won Monday's general election in a landslide that ended nine years of Stephen Harper's Tory rule.

For many Canadians the vote was a referendum on Harper's management style, criticized as autocratic, and on who was better placed to put a struggling economy back on track.

Canadians appear set to end nine years of Stephen Harper's Conservative rule at the ballot box Monday and elect a Liberal government led by Justin Trudeau.

Polling released Sunday on the eve of the vote showed the Liberals, after a late surge from third place, with a seven-point lead ahead of the Tories.