Anyone 17 years or younger will need to be accompanied by an adult to be admitted to Knott’s Berry Farm or its Soak City water park on Fridays, Saturdays, and now Sunday, as the park extended the chaperone policy on July 26.

The extension comes less than a week after Knott’s implemented the policy. It was the park’s response to a series of violent fights involving teenagers forced Knott’s to close three hours early on July 15.

In an email to the park’s mailing list, Knott’s said, “Following the well-received chaperone policy that went into effect this past weekend, we have decided to extend the chaperone requirement to be in effect on Fridays, Saturdays, and Sundays, and may add other days of the week as necessary. This extension is in effect until further notice and subject to change.”

Along with extending the chaperone policy to Sundays, Knott’s is allowing one chaperone, aged 21 or older, to accompany up to four younger guests. The previous limit was three guests per adult chaperone.

The policy still makes it clear that chaperones can’t simply let minors go off on their own once they’ve passed through the park entrance: “Chaperones must accompany their party during entry, remain with their party at all times during their visit to the park, and be available by phone throughout their stay. Guests ages 17 years old or younger who are found inside the park unaccompanied by a chaperone will be subject to ejection.”