Great white shark sighting reported in Half Moon Bay

File photo of Pillar Point Harbor in Half Moon Bay. Photo: Duncan Sinfield/KTVU.

Authorities were advising swimmers to use caution when entering the water after a great white shark sighting was reported Saturday afternoon near Pillar Point Harbor.

The shark sighting came in about 1:15 p.m. in the Half Moon Bay area, about one-quarter mile south of Pillar Point Harbor.

The size of the shark wasn't available.