Emergency crews rushed to a Wells Fargo RV Park in Tombstone just before 2:30 a.m. on Sunday, according to a Facebook post from the Tombstone Marshal's Office.
First responders and neighbors helped everyone outside of the burning structures, according to the post.
It stated that one person had to be flown to the hospital for burns and smoke inhalation. That person was later released, according to the Tombstone Marshal's Office post.
By the time the smoke had cleared, two RVs and two trailers were considered a total loss.
Investigators found an electrical issue to be the cause for the flames, according to the post. It stated that they ruled out foul play or arson as a possibility.
The American Red Cross Southern Arizona Chapter is assisting people displaced by the damage.