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

From a U.S. military helicopter crash off Japan to Hillary Clinton turning over her private server to feds, here are the stories we're following.
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Good morning. Here are some of the stories we're following today:

1. Several Injured After U.S. Military Chopper Crashes

A U.S. military helicopter crashed off the Japanese island of Okinawa on Wednesday, leaving seven people injured. The UH-60 Black Hawk performed a "hard-deck landing" on the USNS Red Cloud, the U.S. Pacific Command said. Aerial footage showed the chopper with part of its tail broken off. Read more in NEWS.

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2. Hillary Clinton Turning Over Private Email Server to Feds

Clinton's campaign said it is turning over her private server and a thumb drive to the Justice Department as part of an ongoing investigation into her use of a private email account during her time as secretary of state. A Senate Judiciary committee also said two of the four classified messages discovered in the Democratic presidential contender's emails were labeled "top secret." Read more in POLITICS.

3. Texas Officer Who Killed Unarmed Teen Fired

The suburban Dallas police recruit who fatally shot college football player Christian Taylor, 19, during a break-in at a car dealership early Friday has been fired for "exercising poor judgment," the Arlington police chief said Tuesday. The investigation is continuing and will be forwarded to the District Attorney's office for consideration and for submission to a grand jury. Read more in NEWS.

4. Video Shows Moments Before Ferguson Shooting

Police on Tuesday released surveillance video that they say shows Tyrone Harris, 18, appear to pull a weapon Sunday from his waistband before he was later shot and critically wounded by plainclothes police in the St. Louis suburb. Meanwhile, a state of emergency could be lifted for St. Louis County as soon as Wednesday. Read more in NEWS.

5. Inmates Allege Guards Beat Them After Prison Escape

Prisoners at New York's Clinton Correctional Facility say they were beaten, choked and slammed against walls by guards seeking information after convicted killers David Sweat and Richard Matt escaped from the upstate prison in June, according to complaints. Read more in NEWS.

6. Donald Trump Says Polls Prove He Hasn’t Crossed the Line

The Republican presidential candidate on Tuesday cited his front-runner status as proof that none of his comments have been over the line and threatened to fight back if activists attempt to take over an event like what recently happened to Democratic candidate Bernie Sanders. Read more in POLITICS.

7. Tinder Takes Swipe at Vanity Fair for Dating Article

The dating app's social media team on Tuesday posted more than two dozen tweets in response to a Vanity Fair article about the company and the rise of the "hookup culture." Tinder, a location-based mobile app popular with 20-somethings, disagreed that the people interviewed for the story reflected its entire community. Read more in TECH.

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