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KNOW IT ALL: Thursday's Top 6 Stories at NBC News

From the deadly attack against Americans at a Kabul hospital to more confusion in the sunken Korean ship, see the stories we're following.
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Good morning, and happy Thursday! Here are some of the stories we're following today:

1. Afghan officer kills three Americans at hospital

The attack at the CURE Hospital in Kabul today is the second this month in which a member of the Afghan security forces gunned down civilians. The attacker also turned the gun on himself, but survived, officials said. District police chief Colonel Hafiz Alizada said that the victims were all male and that at least one of the American nationals was a doctor. An American woman was shot and wounded, he added. Read more in NEWS.

2. Ferry crew member: We were ordered to abandon ship

A crew member of the sunken South Korean ferry claims staff was “under command” to abandon ship, even as more than 300 passengers remained trapped on board. Meanwhile, a faulty ship loaded beyond its capacity and negligent crew helped to create the perfect storm of tragedy. Read more in NEWS.

3. Obama warns more sanctions ready for Russia

The president, who’s currently on a diplomatic tour of Asia, said sanctions against Russia are “teed up” if Moscow fails to honor the peace agreement in Ukraine. The countries struck a deal last week that is meant to end the violence in eastern Ukraine, where pro-Russian separatists have seized government buildings. Meanwhile, deadly clashes between the protesters and Ukraine troops have ramped up. Read more in NEWS.

4. Debris washed ashore is likely not from missing plane

Officials said today that they’re confident potential wreckage photographed on Australia’s shore did not come from the missing Malaysian airliner. It’s another disappointment for families who’ve been waiting for any tangible shred of evidence of where Flight 370 could be in the southern Indian Ocean. Read more in NEWS.

5. FDA proposes first regulations for e-cigarettes

The Food and Drug Administration has said it will begin asserting its authority over new tobacco products beginning today, including for e-cigarettes and flavored cigars. That means e-cigarettes would be banned to kids under 18 and the makers of the so-called vaping products would have to divulge what’s in them. Read more in HEALTH.

6. New rules would end concept of ‘Net neutrality’

The Federal Communications Commission is expected to propose guidelines putting an end to “Net neutrality,” which would be a reversal of previous expectations. The concept essentially means all Internet traffic should be treated the same no matter the providers’ networks. Proponents of Net neutrality say it is essential to keeping the Internet free, while some companies claim it’s reasonable to pay for improved access to their customers. Read more in TECH & SCIENCE.

… What’s trending today?

Yankees pitcher Michael Pineda was caught during Wednesday’s game against the Boston Red Sox wearing pine tar on his neck. It’s the second time this month he’s been questioned for having the substance on his body, and it can be used to get a better grip on the ball.

Pineda was ejected from Wednesday’s game in the second inning, and now faces a suspension.

Meanwhile, Pineda's reaction to getting tossed was slightly less explosive than that of George Brett in the most infamous pine tar ejection of all time: