The Fatal Impulse
"Somewhere in Manhattan a lady has a bomb in her purse, and doesn't know it. Even Mary Tyler Moore isn't safe!"
A man fleeing from an attempt to assassinate a political candidate puts a small bomb in the bag of a woman in an elevator. The police spend the evening looking for the mystery girl and the bomb. Originally aired November 29, 1960, in the "Thriller" series, Season 1, Episode 11.