On April 5, 1911, 400,000 people lined the sidewalks of New York City to pay tribute to the unidentified victims of the Triangle Shirtwaist Factory fire. | American Experience | PBS

A dropped match on the floor of the Triangle Shirtwaist Factory sparked a fire that killed over a hundred innocent people trapped inside. It was the deadliest workplace accident in New York City's history, and the American factory industry would never be the same. TRIANGLE FIRE airs Tuesday, Jan. 30 at 9/8c, only on PBS. | American Experience | PBS