Canada's jobs minister unveiled stricter rules for hiring temporary foreign workers Friday after allegations of widespread abuses by employers, such as sidelining Canadians for jobs.

The changes are meant to ensure the foreign worker program is used as intended "as a last and limited resort to fill acute labor shortages on a temporary basis when qualified Canadians are not available," Employment Minister Jason Kenney said in a statement.

An Air Canada flight to Brazil packed with World Cup fans was forced to turn back to Toronto Thursday after authorities learned that a man had sneaked onboard.

Air Canada 090 was already over the Caribbean and four hours into the flight when Transport Canada ordered its return to the Toronto International Airport, said officials and witnesses.

A tornado Tuesday afternoon destroyed or badly damaged up to 100 homes in Canada's Ontario province, authorities said Wednesday after surveying the devastation.

"It's pretty bad," government Minister Kellie Leitch told a nationally-televised press conference, adding that the twister destroyed "up to 100 homes."

Canada's prime minister on Monday defended a proposed new law against prostitution, calling the sex trade inherently "bad and harmful."

Prostitution is "unacceptable to Canadians and unacceptable to our government," Prime Minister Stephen Harper said.

Three prisoners, deemed extremely dangerous by police, have broken out of a Canadian jail in a helicopter, local media reported, the second such daring jailbreak recently in Quebec.

In March 2013, two inmates were lifted on a hijacked helicopter from a prison north of Montreal. They were both quickly re-arrested, along with the two accomplices who had helped get them out.

A gunman suspected of killing three Canadian police officers and wounding two others in a brazen attack surrendered Friday after a manhunt that put an eastern province under lockdown.

The search for Justin Bourque, who is alleged to have carried out the brazen attack in the country's easternmost province of New Brunswick on Wednesday, had put the city of Moncton on lockdown for more than a day as police hunted the man described as armed and dangerous.

Scores of Canadian police were scouring the woods in the eastern province of New Brunswick early on Thursday, hunting for a man believed to have shot dead three officers and wounded two others in a brazen attack.

Residents were told to lock themselves up inside their homes in Moncton, the province's largest city as police searched for the alleged shooter, 24-year-old Justin Bourque, who was described as armed and dangerous.

Australian Prime Minister Tony Abbott will visit France for the 70th anniversary of the D-Day landings, before traveling to the United States and Canada, he said Saturday.

Abbott said he would join French President Francois Hollande and other heads of government at the British services at the Bayeux Cathedral and Cemetery and the international ceremony at Sword Beach, Ouistreham.

A Canadian was convicted Friday of trying to join Somalia's Shebab militants, marking the first time Ottawa has brought charges of attempting to participate in terrorist activity.

Mohamed Hersi, 28, was arrested at Toronto's airport in March 2011 as he was about to leave for Cairo.

A Muslim organization on Monday sued Canadian Prime Minister Stephen Harper and his spokesman for libel for linking the group to Hamas, which Canada lists as a banned terrorist organization.

The National Council of Canadian Muslims (NCCM), which filed the claim in Ontario Superior Court, had asked the prime minister's office in January to bar a rabbi accused of links to an American anti-Muslim "hate group" from Harper's first official trip to Israel, the West Bank and Jordan.