CONCOW — A roadblock Wednesday outside Concow was related to Cal Fire’s investigation into where and how the deadly Camp Fire started, Cal Fire-Butte County Chief Darren Read said Thursday.
The roadblock, which was on Concow Road somewhere between Mountain Pine Lane and Rim Road, was manned by security guards Wednesday afternoon. 

Read said he would make an announcement related to the closure Thursday evening.  Read said Cal Fire’s probe of the Camp Fire’s cause and origin, which sparked Nov. 8 and has become the state’s deadliest and most destructive wildfire ever, has led investigators in multiple directions, but he would not provide more details about his announcement.

A cause of the fire has not been released. The roadblock outside Concow is several miles away, as the crow flies, on a ridge far above the Camp Fire’s reported origin near Pulga “under the high-tension power lines” across the Feather River from Poe Dam, according to firefighter radio transmissions reviewed by Bay Area News Group.

PG&E’s president, Geisha Williams, previously told E-R reporter Laura Urseny that there was a power outage about 15 minutes before the Camp Fire was first reported, and a later aerial patrol observed damage in the area of transmission lines.

Butte County District Attorney Mike Ramsey said Wednesday that PG&E is cooperating with fire investigators, but it was not clear whether the utility’s transmission tower caused the fire.  Ramsey said fire investigators hoped to wrap up their investigation Wednesday of the initially reported Camp Fire ignition point near Pulga. The District Attorney’s Office was involved in the investigation in case criminal charges are recommended by Cal Fire.

Read said Cal Fire is conducting a thorough investigation but could not speak to its specifics.