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

A look at the key headlines.
Image: Brexit referendum
An illuminated "In or Out" sign is pictured outside a house in Hangleton near Brighton in southern England.GLYN KIRK / AFP - Getty Images

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

1. No End to Gun Control Sit-In as GOP Heads Home

Revolt in the House of Representatives turned raucous overnight, with protesting Democrats shouting down Speaker Paul Ryan's attempts to restore order during a gun-control protest that stretched into its 18th hour. Earlier, Republicans branded the move as a publicity stunt before summarily adjourning the chamber until after the Fourth of July. Read more in POLITICS.

2. House Floor Protest: Can They Do That?

Democrats, led by civil rights icon Rep. John Lewis, remained engaged early Thursday in a sit-in on the House floor in an effort to force a vote on gun control measures. Are they allowed to do that? Has this happened before? Read more in POLITICS.

3. Fact Check: How True Were Trump’s Clinton Claims?

Donald Trump delivered a speech Wednesday billed as a broadside attack on presumptive Democratic nominee Hillary Clinton's foreign policy and economic record. Trump called the address an opportunity to "discuss the failed policies and bad judgment of Crooked Hillary Clinton." But how accurate were his claims? Read more in POLITICS.

4. Europe Holds Breath as U.K. Goes to Polls on ‘Brexit’

Polling stations opened at 7 a.m. (2 a.m. ET) with a record-setting 46.5 million people registered to cast their ballot by 10 p.m. (5 p.m. ET) over what has been dubbed the "Brexit" question — whether or not the U.K. should leave the European Union. Read more in NEWS.

5. Sailors Face Discipline After Iran ‘Calamity of Errors’

A Navy investigation into how sailors ended up in Iranian custody has been completed and will recommend disciplinary action, senior military officials said. Read more in NEWS.

6. Severe Weather Hits Midwest — With More Coming

A tornado was spotted southwest of Chicago on Wednesday night as a second round of storms swept through a large part of the Midwest — after a first wave cancelled more than 100 flights. Read more in NEWS.

7. Body Found in Search for Missing Family Off Florida

A body wearing a life vest was discovered in the search for a man and his three teenage children who went missing during a sailing trip off the western coast of Florida, the Coast Guard said. Read more in NEWS.

8. ‘Gutless Wonder,’ Pal Convicted of Trying to Aid ISIS

During the trial against Nader Salem Elhuzayel and Muhanad Elfatih M.A. Badawi, prosecutors characterized the Orange County men as obsessively praising ISIS on social media as they shared photos of beheadings of "unbelievers." Read more at NBC LOS ANGELES.