Although its not being called an arson, fire investigators are asking for your help in finding the cause of the Monticello Fire. 

Cal Fire is turning to the public to find if there were any suspicious people in the area of where the wildfire started.

Cal Fire's Dennis Mathisen says they're looking at the area between the Canyon Creek Resort and Pleasant Valley Road near Highway 128.

"If anybody has any information or saw anything that evening of July 4, around 9:30 in the evening, we're asking them to call our arson tip line," Mathisen said. 

Mathisen says fire investigators have been working hard, trying to determine the cause.

Investigators are not saying the fire was arson, however every possibility is still on the table. 

If you have any information, you can call the arson hotline at 1-800-468-4408. 

As of last night, the Monticello fire has burned more than 6,400 acres and is 74 percent contained.