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

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

1. Inmates 'Groom' Staff at Breakout Prison: Sources

Inmates at the Clinton Correctional Facility — where two killers broke out almost a week ago — looked for the "weakest links" among the staff in an effort to exploit them for preferential treatment and more, two sources familiar with that prison told NBC News. A corrections department employee says the manipulation — called "grooming" — has become more of an issue than prison workers wanted to admit. Read more in NEWS.

2. Third Man Arrested in Boston Terrorism Plot

A Rhode Island man was arrested Thursday night in connection with an alleged terrorism plot that left a Boston man dead last week, the FBI said. Nicholas Rovinski, 24, of Warwick, is the third, unidentified man referred to in court documents with whom Usaamah Abdullah Rahim and David Wright met on a Rhode Island beach to discuss an alleged plan to kill police officers. Read more in NEWS.

3. Judge Backs Charges for Cops in Tamir Rice Killing

Acting under a rarely used provision of Ohio state law, a judge found probable cause Thursday to charge Cleveland police officer Timothy Loehmann with murder in the fatal shooting of 12-year-old Tamir last year. But the ruling is only advisory and doesn't affect the separate grand jury investigation. Read more in NEWS.

4. Twitter Announces CEO Is Stepping Down

Embattled Twitter CEO Dick Costolo will leave his post July 1 and be replaced temporarily by the site's founder, Jack Dorsey, the company announced Thursday. Costolo said he began talking with board members last year about a succession plan, and with a strong team in place, both parties ultimately agreed "now is the right time." Read more in TECH.

5. Hackers Have Data on Every Federal Employee: Union

U.S. officials say they are still trying to assess the damage caused by a massive cyberattack on the federal government, while a union representing federal workers on Thursday claimed that the information of every current and retired federal employee was exposed. Read more in TECH.

6. Doctors Felt Germanwings Pilot Was Unfit to Fly

A French prosecutor says that some doctors who treated Andreas Lubitz, who crashed a Germanwings jet in March, felt he shouldn't fly — but did not tell his employers because of German patient secrecy laws. Read more in NEWS.

7. LeBron Accidentally Exposes Himself on Live TV

Moments before Game 4 of the NBA Finals began on Thursday night between the Cavaliers and the Warriors, James inadvertently exposed himself to millions watching on live television. His wardrobe malfunction preceded his worst offensive night of the series, which is now tied at 2-2. Read more in SPORTS.

Nightly Spotlight

With California's historic drought entering its fourth year with no end in sight, the state is taking the plunge with plans to turn the ocean into drinkable water.

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