Three skin divers encountered a 12-foot tiger shark in waters off Sans Souci Beach in Waikiki on Sunday.

The divers came in near the Natatorium and reported to lifeguards that the shark was just outside the reef, about 400 to 500 yards offshore in 15 feet of water.

“That’s close to where there’s a lot of activity,” said Ocean Safety Division Chief of Operations Jim Howe.

Lifeguards put up shark warning signs and warned the public in the water and on the beach until sunset.

There were no further sightings Sunday or Monday.

Howe said that the shark was eating the fish on one of the divers’ stringer lines. They let the shark eat the fish and had to leave it out there, he said.

“When they feed, they leave,” he said. “They don’t hang around.”

As for sharks, “They’re always around,” Howe said.

Early last week, an 8-foot tiger was reportedly seen in Kailua at Castles and Kalama Beach Park, Howe said.

The first alert: “Turtles crawling up onto the beach,” he said.