GRAND CANYON NATIONAL PARK, Ariz. (AP) — Authorities at Grand Canyon National Park continue to search for a Northern California man reported missing after a hike.

National Park Service officials say 66-year-old Peter Francis Schwab of Healdsburg was last seen Friday on a river trip on the Colorado River.

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They say Schwab was on a small beach downriver from National Canyon.

Park officials say Schwab was reported missing after a day hike to the Narrows in National Canyon.

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Grand Canyon rangers are searching the area and are asking anyone who may have seen Schwab to contact the Park Service.

According to park officials, Schwab was last seen wearing a tan, full-brim hat, a white long-sleeved shirt, gray cargo shorts and Teva shoes/sandals. He is about six-feet tall and has grey hair and hazel eyes.

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Any tips that can help locate Schwab can be sent to NPS ISB Tip Line at 888-653-0009.