KNOW IT ALL: Tuesday's Top Stories at NBC News

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Good morning, and happy April Fools' Day. Here are six of the top stories we are following this morning at NBC News:

1. Search for missing jet still depends on finding wreckage

With hardly any tangible clues to go on, the hunt for the missing Malaysia Airlines flight still relies on pinpointing wreckage. In the three weeks since the crash, there have been a number of false leads, and officials warn they have a “low confidence of finding anything” in the newest search area in the southern Indian Ocean. Read more in NEWS.

2. Technical glitches disrupt last day of Obamacare enrollment

Open enrollment ended Monday for uninsured Americans to sign up under the federal government’s health care law. But the website at crashed, frustrating users. It remains to be seen how successful the program will be as more than 6 million Americans signed up by day’s end. Read more in HEALTH.

3. Officials identify more victims in Washington mudslide

Another 22 people have been identified as victims either missing or unaccounted for in the deadly disaster near Oso on March 22. As of Monday, 24 bodies have been recovered with 18 of them formally identified. Meanwhile, victims’ families must deal with the financial burden of burying their loved ones. Read more in NEWS.

Players with professional Major League Soccer team the Seattle Sounders visited the local community of Darrington to show their support:

4. GM recalls another 1.3M vehicles for faulty steering issues

General Motors said Monday the recall is related to the sudden loss of power steering capabilities in six models, including the 2004 and 2005 Chevrolet Malibu and Malibu Maxx, the 2004 to 2007 Saturn Ion, and the 2005 Pontiac G6. The recall comes on the heels of a massive ignition switch recall of 2.6 million GM vehicles worldwide. Read more in BUSINESS.

5. South Korea investigates whether drone came from north

An unmanned aircraft that plunged onto the South Korean island of Baengnyeong on Monday afternoon may have originated from North Korea, officials in Seoul said. The two countries that same day were engaged in an exchange of hundreds of artillery shells during maritime training exercises — stoking tensions on the peninsula. Read more in NEWS.

6. Veterans suffering from PTSD turn to pot underground

The veterans say they’re turning to marijuana to manage their anxiety and other symptoms associated with post-traumatic stress disorder. With doctors unable to prescribe pot via Veterans Affairs hospitals, these vets are using an illegal underground to get the drug. Read more in HEALTH.

… What’s trending today?

The return of America’s national pastime on Monday brought the requisite trash talking — but also a lot of trash.

A memorial statue dedicated to Texas Rangers fans — and specifically mentions a firefighter who died after falling at the team’s stadium in 2011 — was littered with beer bottles and cans on opening day. The Rangers were forced to apologize for the unsightly mess:

“The Rangers Fans statue is a cherished component of Globe Life Park in Arlington and the club will make certain this situation does not occur in the future.”