In your own words, per, NIJ. (2009) briefly, discuss/list the actions a lead investigator should do upon arrival at a fire and/or arson scene.
Reference
NIJ. (2009). A Guide for Investigating Fire and Arson: Arriving at the Fire and/or Arson Scene. Retrieved from https://www.nij.gov/topics/law-enforcement/investigations/crime-scene/guides/fire-arson/pages/arrive.aspx