Authorities monitored the beach Tuesday night, while officials with the Pacifica Public Works plan to post signs warning the public about the incident, according to the report. State Parks officials said a 12-foot-long great white shark was spotted by two fishermen at a Santa Barbara beach on Saturday afternoon. The shark displayed violent behavior at Tajiguas State Beach, one mile west of Refugio State Beach. State Parks officials said the shark reportedly came between two fishermen on kayaks, and at one point lifted one of the kayaks out of the water, but didn't capsize it. The fishermen were not hurt. Because of the shark's behavior, there is now a 72-hour closure for water recreation in the immediate area of up to six miles. The beach areas will remain open.