An urgent search is underway for a beloved Maryland school teacher, Mariame Toure Sylla, who has been missing for nearly 10 days. She was believed to have been last seen on a walk and hasn't been heard from since. Melinda Brown, a substitute teacher who worked with Sylla, discusses what she's doing to bring more attention to this case to strengthen the search efforts. Watch #MorningInAmerica: newsnationnow.com/joinus #missing #Marylandteacher #searchandrescue Start your day with "Morning in America," NewsNation's live three-hour national morning newscast hosted by Adrienne Bankert. Weekdays starting at 7a/6C. #MorningInAmerica NewsNation is your source for fact-based, unbiased news for all America. More from NewsNation: newsnationnow.com Get our app: trib.al/TBXgYpp Find us on cable: trib.al/YDOpGyG How to watch on TV or streaming: trib.al/Vu0Ikij