Investigators in Antioch are examining a series of fires in Antioch that have been considered to be the work of an arsonist.
All five fires cropped up within a one mile radius Tuesday night, scorching mostly grass and trees, according to fire officials.
"We've eliminated all natural causes so it's definitely considered arson at this point," Contra Costa County Fire Protection District Battalion Chief Jim Huntze said.
The first fire occurred around 8:50 a.m. behind the Contra Costa County Fairgrounds, Huntze said. Over the course of the next 50 minutes, four more blazes ignited.
An investigation is ongoing.