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KNOW IT ALL: Tuesday's Top 7 Stories at NBC News

From to deadly flash floods to deadly wildfires, see the top stories we're following today.
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Good morning. Here are the top headlines from NBC News.

1. 8 Killed, 5 Missing in Utah Flash Floods

Flash flooding triggered by a strong thunderstorm killed at least eight people in southern Utah, authorities said. Five others remained missing early Tuesday. "This hit with a vengeance we haven't seen for some time," said Kevin Barlow, the assistant fire chief in Hildale, a town on the Utah-Arizona border. Read more in NEWS.

2. Hungary Shuts Out Migrants and Refugees

Hungary hopes a newly constructed border fence will stem the flood of people from Syria and beyond pouring through the country's borders. Officials told refugees and migrants — who have been crossing through Hungary in an effort to get to Europe — that they would have to travel to a transit center and apply for asylum. Read more in NEWS.

3. Slain Delta State Professor Called ‘Star’ Teacher

A Delta State University professor shot dead on the Mississippi campus by another faculty member was a "wonderful fellow" and a "star," the university's president said early Tuesday. Police say Shannon Lamb fatally shot 39-year-old colleague Ethan Schmidt. Lamb killed himself hours later while being pursued by police. Read more in NEWS.

4. 23,000 People Displaced by Two California Wildfires

A blaze raging north of San Francisco known as the Valley fire has burned across 95 square miles, destroyed at least 400 homes and claimed one life. A number of people remain unaccounted for. A second blaze, known as the Butte fire, was burning southeast of Sacramento and forced at least 10,000 people out of their homes. Read more in NEWS.

5. North Korea Restarts Nuclear Plant

North Korea said on Tuesday its main nuclear complex was operating and it was working to improve the "quality and quantity" of its weapons which it could use against the United States at "any time." The country often makes threats against the United States and South Korea. Read more in NEWS.

6. Trump Touts Immigration Plans at Texas Rally

Trump hit the major points of his immigration plan — slamming sanctuary cities and pressing his reasoning that illegal immigration must be stopped — during a rally Monday night in front of more than 15,000 people in Dallas. Read more in NEWS.

7. 37 Face Charges in Hazing Death of College Freshman

A grand jury has recommended charges against 37 members of a fraternity at New York City's Baruch College. The Pi Delta Psi members are accused of killing freshman Michael Deng during a "brutal" hazing ritual in 2013. Read more in NEWS.

Nightly Spotlight: Thoughts From Front Lines of the Refugee Crisis

"We come from different cultures, we speak different languages, but when you look into the eyes of the refugees who have crossed here, you understand that there's no difference in our innate determination to do what we have to do for the sake of our children," Lester Holt said from Röszke, Hungary.