Swimmers were forced out of the water at Mullaloo Beach in Perth's northern suburbs after a 2.5-metre tiger shark was spotted close to shore at midday.
The ocean predator was swimming through the shallows drawing quite a crowd on a hot summer's day as families enjoyed the school holidays.
Lifesavers were forced to close the beach and ordered swimmers from the water.
It's in the exact same spot where a shark of a similar size caused a scare just last Thursday.
The beach reopened two hours later, and the shark was nowhere to be seen.