Officials at the Channel Islands National Park have issued the following warning:

Shearwater TERN
“Great white sharks have been observed in this area attacking California sea lions. There have been no shark attacks on humans. There have been three attacks on California sea lions by great white sharks in the past few months including one at the Santa Barbara Island Landing Cove and two offshore of Cat Canyon on the southeast side of the island. The public is duly warned to enter the water at their own risk at Santa Barbara Island due to a potential safety hazard effective June 30, 2010, and until further notice.”
Shearwater TERN