Police in Canada have foiled a plot in which at least two people had planned to open fire in a crowded public space on Valentine's Day before killing themselves.
Three people have been arrested and a fourth person was found dead in a home, Nova Scotia Royal Canadian Mounted Police Commander Brian Brennan told a press conference.
Commander Brennan did not reveal the group's motives for planning the attack - thought to be targeting a shopping complex - but said the were not "culturally motivated".
The RCMP received a tip-off Thursday morning that a 19-year-old man and a 23-year old woman had weapons and planned to go to a public location in Halifax on Saturday with "a goal of opening fire to kill citizens, and then themselves," Brennan said.
The 19-year-old man was found dead in a residence and the woman and a 20-year-old man were arrested in the early hours of Friday morning at Halifax Stanfield International airport, police said.
The trio remain in custody and no further arrests are expected.
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Tough new laws announced by Canada will make it a crime to call for a terror attack and allow police to detain anyone suspected of being involved in a plot without charge for up to seven days.
Work to toughen the law began in October after a gunman killed a soldier at Canada's national war memorial in Ottawa before storming parliament.
The attack came two days after a man said to be inspired by the Islamic State (IS) group, ran over two soldiers in a car park in Quebec, killing one and injuring the other before being shot dead.
Under the current law it is a crime to make a specific threat, but the new measures will criminalise calling for general terror attacks on Canada or to promote or advocate others to carry out terrorism elsewhere.
The penalty will carry a maximum of five years in prison and authorities will also be able to remove terror-related material from any Canadian website.
Over the last few years a great evil has been descending upon our world, an evil that has been growing more and more powerful, violent jihadism.
Mr Harper said jihadists had declared war on Canada and it would be a grave mistake to ignore their threats.
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A British national is among three climbers who fell to their death in Canada.
The bodies of a man and two women were found in a crevasse below Joffre Peak in British Columbia on Monday.
It is understood the climbers fell almost 300 metres (1,000ft) on the mountain in the Pemberton area, north of Whistler.
A Foreign and Commonwealth Office said: "We can confirm the death of a British national in Canada. We are providing consular assistance to the family at this difficult time."
However, he did not confirm local reports that the British victim was Scottish.
A Canadian man who killed a Chinese student then posted his victim's body parts to schools and political figures has been found guilty of first-degree murder.
Luka Magnotta, 32, had admitted killing and dismembering engineering student Jun Lin, 33, in Montreal in 2012, but pleaded not guilty on the grounds of mental illness.
A jury deliberated for eight days before delivering its verdict today.
Magnotta was also found guilty of committing an indignity to a human body, publishing and mailing obscene material, and criminally harassing Canadian Prime Minister Stephen Harper and other members of Parliament.
A first-degree murder conviction in Canada carries an automatic life sentence with no possibility of parole for 25 years.
The victim's father, Diran Lin, who travelled from China to attend the trial said: "I had come to see your trial system to see justice done, and I leave satisfied that you have not let my son down."
Following the killing in spring 2012, Magnotta fled to Europe and was caught in a Berlin internet cafe, where he was reading about himself.
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Country music legend Johnny Cash's son was arrested after drunkenly stripping down to his underwear at a Canadian airport, police said.
John Carter Cash was returning from a hunting trip in Deer Lake, Newfoundland, when he began taking his clothes off, according to Canada's CBC News.
Airport security called in the Royal Canadian Mounted Police (RCMP) but by the time officers arrived Cash had put his clothes back on. He had missed his flight.
Officers decided not to charge Carter Cash, who followed his parents into the country music business, because he cooperated with police and security and he had no criminal record.