City officials have posted warning signs at Haleiwa Beach Park after a non-aggressive shark was spotted late this morning fronting the lifeguard tower.

At 11 a.m. today, officials said the 8- to 10-foot thresher shark was spotted about 5 feet offshore of the lifeguard stand.

All beach and ocean patrons in the area have been warned, and there are currently no people in the water, officials said.