T Park will face tougher security measures, including metal detectors and more restrictions in and around the venue.
Metal detectors previously were used at the park twice before - during a visit by former President Bill Clinton and at a private event. But Giants officials said they hope to avoid major delays by opening the park's four gates three hours before Monday's Home Run Derby and Tuesday's All-Star Game.
Ticket-holders also won't be allowed in-and-out privileges at the ballpark, officials said.
But fans still will be able to enjoy the events for free from the waterfront promenade beyond the wall in right field, where extra security officers will be posted. The San Francisco Police Department estimates it will spend $500,000 to cover overtime and other expenses for heightened security around the ballpark during All-Star events.
The FBI's San Francisco office is bringing in more than 150 extra agents, including bomb and hazardous materials experts, negotiators and SWAT teams to guard against a possible terrorist attack, FBI spokesman Joseph Schadler said.
``We're treating it as a possible high-profile target,'' Schadler said. ``You can't get more American than baseball, apple pie and mom, right?''
Other security measures include road closures and a ban on motorized boats and non-motorized boats longer than 20 feet in McCovey Cove from Saturday through Tuesday.
The U.S. Coast Guard will enforce a security zone around the cove, inspecting vessels that want to get in, said Alan Haraf, a Coast Guard spokesman. It also will maintain a 50-yard security zone around piers near the Bay Bridge, he said.

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