UPDATE: Camp Pendleton is reporting that crews spent Tuesday evening fighting a fire caused by afternoon training.
By nightfall, the blaze had scorched some 250 acres and was 80 percent contained, Camp Pendleton reported.
The fire was nearly three miles northwest of the air station and moved eastward. Smoke could be seen throughout Southwest Riverside County.
Assets fighting the fire included one fixed wing aircraft, one helicopter and four strike teams from Camp Pendleton, as well as other local jurisdictions.
There are no reports of injuries or threats to structures.
The base has been holding controlled burns this week to prevent wildfires; late Tuesday afternoon, Cal Fire reported a total of four fires were burning on Camp Pendleton. --Daniel Woolfolk contributed to this report.
ORIGINAL POST: Smoke seeping over the valley Tuesday afternoon is due to a controlled burn on Camp Pendleton, base officials are reporting.
The fire is located on the east side of the base.
According to officials, this is the time of year when controlled burns on the base are more prevalent, provided weather conditions permit.