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

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Good morning, and happy Tuesday. Here are some of the stories we're following today:

1. Mom of missing Nigerian schoolgirl IDs daughter

The mother spotted her daughter in the shocking video, which purportedly shows several young women being held captive by Islamist rebels, according to their school. The group, Boko Haram, said Monday it would release the girls, who were kidnapped April 15, in exchange for government-held rebels. It is unclear when the video was filmed. Read more in NEWS.

2. German foreign minister visits Ukraine to mediate

A large majority of eastern Ukrainians voted in two separate referendums Sunday to break from the pro-West government in Kiev. The controversial vote is not being recognized by the U.S., Europe or Ukraine’s central leadership. Still hoping for a compromise, Germany’s foreign minister, Frank-Walter Steinmeier, traveled to Ukraine today to try and broker talks between Kiev and the pro-Russian separatists in the East. Read more in NEWS.

3. ‘He’s got AIDS’: Donald Sterling goes after Magic

The embattled Los Angeles Clippers owner sure knows how to dig himself in a deeper hole. Sterling, who tried to apologize for earlier racist remarks, decided in an interview with CNN’s Anderson Cooper to bash hoops legend Magic Johnson. “He acts so holy. He made love to every girl in every city in America and he had AIDS. … I went to my synagogue and prayed for him,” Sterling said. Johnson had publicly criticized Sterling after a secret phone call revealed the Clippers owner told his gal pal not to bring any black people to games. Read more at NBC SPORTS.

4. Clay Aiken’s political opponent found dead

Keith Crisco, 71, was locked in a close race with Aiken for a North Carolina House seat. But in an unexpected turn, Crisco died Monday after falling in his home, according to reports. “He was a gentleman, a good and honorable man and an extraordinary public servant,” Aiken said in a statement. The former “American Idol” crooner was leading in the polls Monday. Read more in POLITICS.

5. Second case of mysterious MERS virus in U.S.

A 44-year-old man is the second known case of MERS in the U.S., but the Centers for Disease Control and Prevention say people shouldn’t panic. “The risk to the general public remains very low,” CDC’s Dr. Anne Schuchat told reporters. Middle East respiratory syndrome, or MERS, was only identified in 2012, but it’s deadly — killing a quarter of the more than 500 patients it’s infected so far. Read more in HEALTH.

6. Right on schedule: Taliban launches offensive

The Taliban made good on their promise to unleash an annual spring offensive Monday, storming a government building in the east and striking a police checkpoint to the south, killing nine policemen. Read more in NEWS.

7. Where is radio icon Casey Kasem?

The 82-year-old former disc jockey, who made his name rattling off the country’s “Top 40” hits, is being treated for a degenerative disease. His daughters, however, told a Los Angeles judge that they have no idea where he’s being held. Kasem’s adult children have complained for months that they weren’t allowed to see their father, and that he was taken last Tuesday to an undisclosed location by his wife, Jean. Her attorney said he was “no longer in the United States.” Read more in POP CULTURE.

… What’s trending today?

The Batmobile’s back!

Director Zack Snyder teased fans Monday with a glimpse of Batman’s ride for the upcoming “Man of Steel” sequel.

“Could be time to pull the tarp...Tomorrow?” Snyder teased on Twitter.

Ben Affleck will play the Caped Crusader in the sequel, which is set for release May 2016.