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

A look at the key headlines.
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Good morning. Here are some of the stories we're following today:

1. Another Bombing Suspect? Brussels Hunt Enters Day 3

Is there another Brussels terror attacks suspect on the run? That's the latest unanswered question to emerge Thursday, part of a growing list amid a lack of public information. Meanwhile, Salah Abdeslam, another suspect with ties to the terror cell, is in custody in Belgium, and his lawyer says that he would not fight extradition back to France. Read more in NEWS.

2. Should the CIA Use Drones to Kill ISIS Targets

As ISIS claims responsibility for its second devastating terror attack against the West in six months, a dispute is playing out in Washington over whether the CIA should be using armed drones to kill the group's leaders, NBC News has learned. Read more in INVESTIGATIONS.

3. Hundreds Trapped on Colorado Highway in Monster Storm

Several hundred motorists were stranded on highways in Colorado during a wintry storm late Wednesday. Some people had spent more than eight hours in their vehicles while others had abandoned them and headed to shelters, officials said. Read more in NEWS.

4. Debris 'Almost Certainly' Came From Flight MH370: Officials

The debris recently discovered in Mozambique most likely come from the missing Malaysia Airlines flight, which vanished mysteriously two years ago, Australian officials said. Read more in NEWS.

5. Cruz Warns Trump in Feud Over Wives

Ted Cruz tweeted to his GOP rival Donald Trump that "real men don't attack women" after the billionaire retweeted an unflattering photo of Heidi Cruz. The exchange came after Trump showed no sign of backing down in the dispute over a Cruz campaign ad featuring a racy picture of Melania Trump. Read more in POLITICS.

6. Elaborate Drug Tunnel Found Under California Home

Investigators have uncovered dozens of cross-border drug tunnels over the years — but they say one raided this week in California is the first where pot smugglers bought a parcel of land and built an entire house over it. Read more in INVESTIGATIONS.

7. North Carolina Approves Law Opposing Transgender Bathroom Rule

State legislators decided to rein in local governments by approving a bill Wednesday that prevents cities and counties from passing their own anti-discrimination rules. The new legislation also deals a blow to the LGBT movement after success with protections in cities across the country. Read more in NEWS.

Nightly Spotlight

Fans remember the life and career of Joe Garagiola, the big league catcher who went on to become a Hall of Fame broadcaster as the voice of baseball on NBC for decades.