5 things to know for Feb. 4: Shutdown ends, Assassination attempt, Jill Biden’s ex-husband, Nuclear talks, Bitcoin

Authorities say they are aware of reports of possible ransom notes in the disappearance of Nancy Guthrie, the mother of “Today” anchor Savannah Guthrie. The case has gripped the nation after Nancy, 84, was abducted from her home in a quiet Arizona neighborhood where she lives alone. Here’s what else …