KNOW IT ALL: Thursday's Top 6 Stories at NBC News

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Good morning. Here are some of the stories we’re following today:

1. N. Korea calls knife attack on U.S. ambassador 'punishment'

North Korean state media called the knifing of the American ambassador to South Korea "punishment" as the U.S. Embassy in Seoul beefed up security following the attack on Mark Lippert. South Korean police said that the suspect shouted that the rival Koreas should be unified as he lunged at the ambassador. Police are considering whether to charge 55-year-old Kim Ki-jong with attempted homicide, a police official involved in the case told Reuters. Read more in NEWS.

2. Hillary Clinton breaks silence on email scandal

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Hillary Clinton tweeted Wednesday night that she has asked the State Department to release all of her emails from her four years as secretary of state. Her request comes after the disclosure that she used a private email address for official government business came to light this week. State Department spokeswoman Marie Harf said the department would review the emails "as quickly as possible," but said the process could take a while. Read more in POLITICS.

3. Ferguson protesters face down cops after DOJ report

Protesters squared off with police in Ferguson, Missouri, on Wednesday night, following a critical Department of Justice report prompted by last August's shooting of unarmed black teenager Michael Brown. A crowd of several dozen gathered outside the Ferguson Police Department after the report found evidence of racial bias within the force. Ferguson's mayor announced Wednesday that one police official was fired and two were suspended in light of the report. Read more in NEWS.

4. Boston bombing suspect's lawyer: 'It was him'

Nearly two years after twin blasts rocked the finish line of the Boston Marathon, alleged bomber Dzhokhar Tsarnaev faced a jury for the first time Wednesday. He sat stoically through graphic depictions of bloody carnage and a federal prosecutor's description of him as "a soldier in a holy war against Americans." The trial's long opening day also included a startling admission by Tsarnaev's defense lawyer that "it was him" in surveillance videos dropping a bomb-laden backpack on crowded Boylston Street. Read more in NEWS.

5. Another round of snow slams South and Northeast

A nightmare commute is in store Thursday morning from Texas to New York as the latest blast of winter weather — possibly the last this season — is expected to dump up to 10 inches of snow in parts of the Northeast. Dallas got socked with 3 to 5 inches of snow overnight, while New York City is due for a similar amount through the day. Parts of West Virginia, Ohio and Kentucky are digging out from as much as a foot of snow overnight. Read more in NEWS.

6. Iran official: We believe we are 'very close' to nuke deal

Iran has no intention of building a nuclear weapon, and the sooner the world recognizes that, the sooner there will be a deal aimed at curbing its nuclear capabilities in exchange for the lifting of crippling economic sanctions, Foreign Minister Mohammad Javad Zarif told NBC News. "Iran is not about building nuclear weapons," Zarif said in an exclusive interview Wednesday. He said his country's nuclear ambitions were solely in the pursuit of "scientific advancement" and boosting national pride. Read more in NEWS.

And now this ...

Canadians are paying tribute to the late Leonard Nimoy by “Spocking” their money. What's that? Well, drawing pointy ears and tilted eyebrows on the $5 bank note featuring Canada’s seventh prime minister.