 Here's a reminder for visitors to Catoctin Mountain Park. Part of the park will be closed on Thursday due to increased security measures. The National Park Service said Park Central Road between Thurmont Vista and the Camp Green Top entrance will be closed. Trails to Hog Rock Overlook and Blue Ridge Summit Vista will also be closed. All other trails and roads will remain open. The closures are expected to begin Thursday at 8 a.m. and remain in place until 8 p.m.