State investigators have determined that contact between a tree and electrical lines owned by Pacific Gas & Electric Company caused the Dixie Fire, which started on July 13 and burned nearly a million acres and destroyed more than 1,400 structures before it was contained in late October.

Cal Fire announced the findings in a news release issued Tuesday afternoon, reporting that the findings come following “a meticulous and thorough investigation” to determine the origin and cause of the fire.

The investigative report has been forwarded to the Butte County District Attorney’s Office, which will handle all inquiries regarding the report, Cal Fire officials said.