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

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

1. Boston Terror Suspect Plotted to Behead Activist: Sources

Usaamah Rahim, the terrorism suspect who was killed by police in Boston, abandoned a plot to behead the organizer of a controversial "Draw Muhammad" competition in Texas in favor of killing police officers, law enforcement sources told NBC News. The FBI said that Rahim decided he couldn't wait that long — and chose to attack police officers instead. Read more in NEWS.

2. Ex-FIFA Exec Threatens to Reveal Secrets

One of the top figures implicated in the FIFA corruption scandal has threatened to release documents chronicling "financial transactions" involving Sepp Blatter, who is stepping down as president. Former FIFA vice president Jack Warner claimed the documents also linked soccer's governing body to the general election of 2010 in his native Trinidad and Tobago. Read more in SPORTS.

3. Duggars Say They Feel Like Failures as Parents

Jim Bob and Michelle Duggar, whose family is featured on the reality TV show "19 Kids and Counting," said they "felt like failures" when their eldest son, Josh, admitted to molesting young girls more than a decade ago. The Duggars said on Fox News Channel that Josh inappropriately touched four of their daughters and another girl who was not a member of the family in a series of incidents that began in 2002. Read more in POP CULTURE.

4. Is U.S. Claim of 10K ISIS Dead Believable?

A top U.S. diplomat strayed from a long-held wartime taboo when he reported that 10,000 ISIS militants had been killed in Iraq and Syria, raising questions about how that number was compiled and whether it accurately reflected the U.S.-led coalition's success against the Islamic terror group. Read more in NEWS.

5. Ex-Texas Gov. Rick Perry Enters 2016 Race

Perry announced on Thursday morning that he will seek the Republican nomination for president in 2016 via his website. Perry's official site unveiled a Perry for President logo and a campaign video. Perry also ran for the nomination in 2012, but his bid imploded when he made missteps during the GOP debates. Read more in POLITICS.

6. Lincoln Chafee Calls for Metric System in 2016 Bid

Former Rhode Island Gov. Lincoln Chafee announced he is running for president, becoming the third Democrat to challenge Hillary Clinton. And he said the U.S. should switch to the metric system. "Here's a bold embrace of internationalism: Let's join the rest of the world and go metric," he said. Read more in POLITICS.

7. Cavaliers Take On Golden State in NBA Finals

The Cleveland Cavaliers, led by LeBron James, will play the Golden State Warriors in Game 1 at 9 p.m. ET. The Cavs are seeking their first championship, while the Warriors — leaning on Stephen Curry — are looking for a fourth title, and their first since 1975. Read more at NBC SPORTS.

Nightly Spotlight

Business is booming for a tiny post office in the ghost town of Bridal Veil, Oregon, where wives-to-be craving the postmark flock from all over the country.

Breaking News Emails

Get breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings.