First a soldier guarding a hallowed war memorial was gunned down in Canada's capital. Then shots erupted in the halls of the country's Parliament minutes later.
The two shootings in Ottawa Wednesday left lawmakers barricaded inside offices and parts of the city on lockdown for hours as police searched for suspects.
Ottawa Police lifted the lockdown Wednesday night and said there was no longer a danger to the public.
But many questions remain about the shootings: Who was the gunman? Why did he open fire? And was he acting alone?
After five months of detention in North Korea, Jeffrey Fowle arrived home in Ohio early Wednesday for an emotional reunion with his family.
Stepping off the plane at Wright-Patterson Air Force Base and onto the tarmac, he was embraced by family members, including his three children.
"It's a good sign that the North Koreans released this man unconditionally," former U.S. Ambassador to the United Nations Bill Richardson told CNN's "New Day." "They usually demand a price."
Richardson has helped negotiate the release of prisoners in the past, including from North Korea.
Pyongyang's move is "a signal to the U.S. that says, 'All right, let's start talking,' " and perhaps restart nuclear negotiations, he said.
Facing anger from families of Flight 370 passengers, Malaysia's Prime Minister said Thursday his government will release its preliminary report on the plane's disappearance.
In a TV exclusive, Najib Razak told CNN the report will be available to the public next week.
"I have directed an internal investigation team of experts to look at the report, and there is a likelihood that next week we could release the report," Najib said. Later in the interview with CNN aviation correspondent Richard Quest, he gave a more definitive statement, saying the report will be released next week.
Najib also discussed why he is not yet officially declaring the flight - and the 239 people on board - lost.
The report has already been sent to the International Civil Aviation Organization (ICAO), the U.N. body for global aviation, but not made available to the public.
The ICAO told CNN about a safety recommendation in the report: Malaysia said the aviation world needs to look at real-time tracking of commercial aircraft. It's the same recommendation that was made after the Air France Flight 447 disaster in 2009.
Earlier Thursday, the partner of one of the passengers accused Malaysian authorities of seeming "to be choosing to treat us as if we are the enemy as opposed to an interested party in helping to solve this mystery."
"We need a fresh start here," Sarah Bajc, partner of passenger Philip Wood, said on CNN's "New Day."
"We've been sitting on opposite sides of the table. They have a briefing, they tell us what they know and we ask them questions. That's just kind of broken. I think we need to start from scratch and sit down and have a positive dialogue."
Families don't "necessarily believe" that the Malaysian authorities are "withholding any new information other than the facts that we've already asked for," she added.
A committee representing some of the Chinese families have posted 26 questions on the Chinese social media site Weibo.
Usually, such reports to the ICAO are public, Quest says.
"In most cases, the report is published because it's not a controversial document," he said. "It's a statement of facts - what happened. And if there are any controversial or difficult facts, they can be redacted."
Malaysia has insisted it has nothing to hide and is working to find answers.
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The first sign something was off was when the ground crew at Kahului Airport in Maui noticed a boy wandering the tarmac, dazed and confused.
The story he told officials was even more incredible.
The 16-year-old apparently hitched a ride from San Jose, California, to Maui, Hawaii, in the landing-gear wheel well of a Boeing 767, Hawaiian Airlines said Sunday.
"Our primary concern now is for the well-being of the boy, who is exceptionally lucky to have survived," the airline said.
He certainly is.
If his story pans out - and the FBI has been called in to investigate - he rode in the tiny cramped compartment for almost five hours, at altitudes that reached 38,000 feet, without oxygen and under subzero temperatures.
That has some experts questioning his story.
"It sounds really incredible," said aviation expert Jeff Wise. "Being in a wheel well is like all of a sudden being on top of Mount Everest."
Between the oxygen depletion and the cold, life expectancy "is measured in minutes," Wise said.
But some people have survived. A total of 105 people are known to have attempted to fly inside wheel wells on 94 flights, the FAA's Civil Aerospace Medical Institute says. Of those, 25 made it through, including a 9-year-old child - a survival rate of 24%. One of the flights went as high as 39,000 feet.
The conditions can put stowaways in a virtual "hibernative" state, the FAA says.
Someone could slip into unconsciousness so that the body cools and "the central nervous system is preserved," said CNN aviation expert Michael Kay. Also, he said, "there could be a situation where inside the bay is warmer than the external air temperature and you wouldn't get the instantaneous freezing of the skin."
Still, "for somebody to survive multiple hours with that lack of oxygen and that cold is just miraculous," airline analyst Peter Forman toldCNN affiliate KHON in Honolulu.
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