© Amber HamiltonFlashing lights were visible in the skies above Southern California on June 25, 2014.
The strange pulsating lights could be seen from Orange County down to San Diego around 10:30 p.m., which was about the same time they were visible the previous week, witnesses told KTLA.
Eventually, the lights disappeared.
While the mystery hasn't been solved just yet, the lights may have been related to a training exercise at Camp Pendleton.
The Marine base was conducting a mortar fire training exercise between 7 a.m. and midnight on Wednesday, according to Camp Pendleton Sgt. Christopher Duncan.
The training exercise took place at the Whiskey and Zulu impact areas of Camp Pendleton, Duncan said.
It was not immediately clear whether base had been conducting a training exercise the previous week as well.
... in weather balloons, swamp gas and Venus.