What is the term used for two or more deliberately set fires?

The term used for two or more deliberately set fires is "serial fires." This term specifically refers to a situation where more than one fire is intentionally ignited, typically by the same individual or group, across different locations or within a certain timeframe. Serial fires are significant in the context of arson investigations, as they indicate a pattern that can help investigators determine the motivations and methods of the individual committing the arson.

Understanding this term is crucial for crime scene investigators as it allows them to identify and link multiple incidents, which can be essential for building a case against an arsonist. In contrast, other terms like "blaze" refer more generally to a fire without implying its intentional nature, "incendiary event" could describe any situation where fire is used destructively but doesn't specify multiple occurrences, and "conflagration" typically describes a large and destructive fire, again without the connotation of multiple, intentional ignitions.