What did the Hindenburg hit to ignite the flame?

The Hindenburg ignited after it came into contact with an electrical discharge, likely from static electricity, while it was moored at Naval Air Station Lakehurst in New Jersey. The highly flammable hydrogen gas used to lift the airship was released, and when it mixed with the air and encountered the spark, it resulted in a catastrophic fire. The combination of the hydrogen and the flammable materials in the airship's skin and structure contributed to the rapid spread of the flames.