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KNOW IT ALL: Thursday's Top 8 Stories at NBC News

A look at the key headlines.
Image: Dan Brucker, the manager of Grand Central Tours for Metro-North Railroad, took NBC News behind the scenes to reveal some of the hidden historic secrets, including the world'??s largest example of Tiffany glass.
Dan Brucker, the manager of Grand Central Tours for Metro-North Railroad, took NBC News behind the scenes to reveal some of the hidden historic secrets, including the world's largest example of Tiffany glass.John Makely / NBC News

Good morning. Here are some of the headlines we're following this morning:

1. GOP to Allow Gun Votes After 15-Hour Filibuster

Senate Democrats ended a nearly 15-hour filibuster early Thursday after Republican Party leaders reportedly agreed to allow votes on two proposed gun control measures. The nonstop series of speeches followed the shooting massacre at a gay nightclub in Orlando. Read more in POLITICS.

2. Shooter Was Rejected From Criminal Justice Program

A student at the college where Omar Mateen applied for an intensive six-month law enforcement training program says the Orlando shooter was rejected from the program in 2015 — a course meant to be hands-on and to prepare students to work as law enforcement officers. Read more in INVESTIGATIONS.

3. Hacked Documents Show DNC Plan Against Trump

A hacker has leaked a trove of documents purportedly stolen from the Democratic National Committee, including a 200-page opposition research book detailing aspects of the party's battle plan against Donald Trump. Read more in POLITICS.

4. Wildlife Officials Vow to Find Gator That Killed Boy

Investigators in Florida are working to determine whether any of the five alligators trapped and killed after a 2-year-old was dragged to his death was responsible for the fatal attack. Read more in NEWS.

5. Crashed EgyptAir Wreckage Found: Investigators

A search vessel has found wreckage from Flight MS804 — with only days to go before signal transmitters were expected to expire — the Egyptian committee investigating the crash said Wednesday. Read more in NEWS.

6. Most Brits Want to Quit E.U.: Brexit Poll

Public opinion in Britain has swung sharply in favor of quitting the European Union, according to a poll published exactly one week before the country's historic referendum. Read more in NEWS.

7. Macy’s and Workers Union Reach Deal Averting Strike

Macy's and the union representing the workers at its flagship store in New York City reached an agreement during contract negotiations Thursday morning, the union said. Read more at NBC NEW YORK.

8. Inside the Hidden Secrets of Grand Central Terminal

NBC News has gone behind the scenes to reveal some of the hub's historic secrets — including the world's largest example of Tiffany glass, a private train station customized for Franklin D. Roosevelt and the story of a shoot-on-sight order during World War II. See more in VIDEO.