(FOX40.COM) — CAL FIRE said it responded to five spot fires along a stretch of Eastbound Interstate 80 in Placer County Friday afternoon.

“Each of the fires was held to a half acre or less by firefighters,” the agency said in a social media post.

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Around 2 p.m. on Friday, California Highway Patrol said a stretch from Road 193 to one mile west of Maple Street faced a “serious brush fire situation.”

CAL Fire said the cause of the spot fires is under investigation.