This was on the Liberty Fire December 7 east of Murrieta, California.
(UPDATED September 14, 2018)
The photos below from Flashover.com (referred to in the comments below) show the results of a low drop by a DC-10 on the Liberty Fire, December 7, 2017. They were taken by Jenny Crane.
Above: The Liberty Fire east of Murrieta, California, December 7, 2017. Screengrab from the KTLA video.
(Originally published at 7 p.m. PST December 7, 2017)
KTLA shot some excellent stabilized video from a helicopter Thursday of the Liberty Fire that has burned about 300 acres northeast of Murrieta, California. This is a new fire that erupted this afternoon 17 miles north of another new fire, the Lilac Fire south of Temecula which was 3,000 acres at 7 p.m. PST.
The video, which is almost 2 hours long, has at least 8 shots of air tankers dropping. We skimmed through it quickly and noted where the drops occur, probably missing a few.