Disney plans to begin using metal detectors at its theme parks, and similar changes may come to Universal Studios Hollywood and SeaWorld, officials said Thursday.
Disneyland plans to begin screening guests on Thursday, the Orange County Register tweeted.
"We continually review our comprehensive approach to security and are implementing additional security measures, as appropriate," said a Disney spokeswoman.
Only some guests, who are randomly selected, will have to go through the metal detectors.
The changes in security policy also include discontinuing the sale of toy guns at Disney parks and resorts, and not allowing anyone over the age of 14 to wear costumes into the parks.
Disney has increased the presence of local law enforcement officers at parks over the past few weeks, as well as the use of specially trained dogs.
Universal Studios and SeaWorld are also beefing up their security measures for the busy holiday season.
A Universal spokesman said it is also "testing" the use of metal detectors at its parks, which it has long used for special events.
"We have begun testing metal detection at our theme park. We want our guests to feel safe when they come here. We've long used metal detection for special events, such as Halloween Horror Nights. This test is a natural progression for us as we study best practices for security in today's world," a Universal Studios Hollywood spokesperson said.
At SeaWorld, guests can expect a "thorough bag check" as well as the use of wand metal detector checks.
KTLA's Ashley Soley-Cerro contributed to this report.