LAGUNA BEACH (CBSLA.com) — A brush fire burning in south Laguna Beach has prompted voluntary evacuations in the area.

The fire broke out above the Montage Resort on South Coast Highway near Pacific Coast Highway just after noon on Sunday.

Fire officials informed CBS2 that reverse 911 calls were placed to approximately 30 homes on Nyes Place and some voluntary evacuations were under way.

According to firefighters, the blaze appeared to be holding at three acres as of 1:27 p.m.

At least one water-dropping helicopter, along with approximately 100 firefighters, were dispatched to the firefight.

KNX 1070 NEWSRADIO reported that the northbound PCH was backed up for miles. For live traffic conditions, click here.

The origin of the fire was not immediately known, although a downed power line may be to blame.