SACRAMENTO (AP) — California safety officials on Monday activated a statewide threat assessment system in response to explosions at the finish line of the Boston Marathon. Under the system, officials at threat assessment centers in San Francisco, Los Angeles, Orange County, San Diego and Sacramento review information from federal authorities involving possible local threats, said Kelly Huston, assistant secretary of the California Emergency Management System. "At this point we don't see a connection to California, but it's pretty early," Huston said, adding protection of California's critical systems is a priority.