Two surfers told lifeguards they were chased out of the water this morning by a shark estimated to be 10 feet long at the North Shore surf spot Leftovers — the same spot where a 25-year-old man was critically injured two weeks ago.

Ocean Safety spokeswoman Shayne Enright said the incident was reported at 9:45 a.m.

The surfers were not injured.

Lifeguards are posting shark warning signs at Leftovers and Chuns Beach and near Waimea Bay at a spot called “Uppers.”

A 25-year-old surfer was hospitalized in critical condition Oct. 9 after he was attacked by a shark at a popular North Shore surf break between Laniakea and Waimea Bay at about 10:25 a.m.