City officials removed shark warning signs on North Shore beaches early this afternoon after surveying the waters from Kaena Point to Turtle Bay, but they warn ocean-users to be vigilant after Tuesday’s tiger shark attack on a surfer.

Shark warnings were posted at eight North Shore beaches — Alii, Chun’s Reef Support Park, Ehukai, Haleiwa, Ke Waena, Laniakea Beach Support Park, Sunset and Waimea Bay — shortly after 1 p.m. Tuesday after an 8-to-10 foot Tiger shark bit Joshua Holley at Alligator Rock.

He was treated at Wahiawa General Hospital and released with 42 stitches on his left foot. He also will have to undergo surgery to repair two tendons that were severed from his toes.

The shark watch was lifted after monitoring by lifeguards, state officials and a Honolulu Fire Department helicopter flyover throughout the morning.

Although the warning signs were removed shortly after noon, officials issued a statement noting that shark behavior "is highly unpredictable and sharks are known to be present in the near-shore waters at all times."

On Kauai, meanwhile, Ocean Safety officials reopened Haena and Kee this morning after closing both beaches Tuesday because of a shark sighting and dangerous surf conditions. A shark was also sighted in waters off Haena Beach at about 9:30 a.m. Tuesday, county officials said. Lifeguards reported no shark sightings since then, and the swell has decreased significantly, officials said today.