Shark warning signs are up at a popular North Shore surf spot on Oahu, a short-term worry for surfers and swimmers but no one has been hurt.

• A tiger shark estimated at 8 to 10 feet was spotted off Alii Beach Park in Haleiwa.
• Officials say it was seen eating a turtle just beyond where surfers line up.
• No injuries were reported, and the beach warning signs are precautionary.
• Beachgoers are urged to check posted signs before going in the water.

Outlook: The warnings will likely come down within a day or two if the shark moves on.