Fire and destruction caused by the munitions factory explosion known as the Kings...HD Stock...

The Kingsland explosion was an incident that took place during World War I at a munitions factory in Lyndhurst, New Jersey, United States. An arbitration commission in 1931 determined that, "In the Kingsland Case the Commission finds upon the evidence that the fire was not caused by any German agent."

The U.S. was officially neutral, but American and Canadian companies supplied goods to the Allies giving an incentive for acts of sabotage on American soil. The acts were largely symbolic rather than having any real effect on the war supply efforts and only two acts were of even marginal importance, given the scale of the conflict. It is generally accepted that the acts of sabotage were carried out by the Germans although Germany never formally admitted responsibility. The Kingsland explosion was suspected in the popular media of being German sabotage, but there was no evidence implicating any German official.
https://en.wikipedia.org/wiki/Kingsland_explosion
http://www.northjersey.com/story/news/bergen/2017/01/10/lyndhurst-commemorates-100th-anniversary-historic-kingsland-explosion/96260318/