Some fans will soon have to walk through metal detectors to catch a game at Citizens Bank Park.
The Phillies say the detectors will be installed at the right-field gate on Monday and will be put in use for the first time on July 21, when the team begins a series against the San Francisco Giants at 7:05 p.m.
The detectors are part of a Major League Baseball-ordered pilot program that aims to standardize security procedures.
Fans entering through the right field will be required to go through a metal detector before their tickets are scanned. Cell phones, cameras and other metal items will need to be removed, but people won't have to take off shoes or belts.
Those who enter at that gate but can't go through a metal detector will be screened with a handheld device.
By the start of the 2015 season, MLB teams will need to screen all fans entering the ballparks, the Phillies said.
"We fully support MLB's efforts to implement these enhanced security measures, and look forward to working with them during this pilot program," Sal DeAngelis, the Phillies director of operations and security, said in a statement. "Next year, we expect that metal detectors will be at all entrance gates."
In the wake of the bombings at the finish line of the 2013 Boston Marathon, a number of sports venues have implemented more rigorous security procedures.
Last summer, the Philadelphia Eagles and other NFL teams banned purses, backpacks and other items from stadiums. And runners were screened before entering the start area at November's Philadelphia Marathon.