Shark warning signs have been posted at Maili Beach, and swimmers are also being warned about a shark at Kahe Point beach after lifeguards spotted a shark in the water at the Leeward Oahu beaches.

Honolulu Ocean Safety confirmed the Maili Beach sighting about 10 yards off shore at about 11:20 a.m. today, cleared the water, and posted the signs. The type of shark remains unknown.

Signs are expected to remain up for the rest of the day, and may remain longer if necessary.

At about 2:20 p.m., lifeguards saw a 12-foot shark behaving aggressively near Kahe Point, also known as Electric Beach, in Nanakuli.

Ocean Safety said lifeguards were warning swimmers in the area and encouraged swimmers to see a lifeguard for updated information before entering the water.

Updates will be posted at hawaiibeachsafety.com.