Bondi Beach reopens after shark sighting

The shark that temporarily closed Bondi Beach could have been chasing a school of fish, lifeguards say.

Bondi Beach reopened on Friday afternoon following a shark sighting by a police helicopter earlier in the day.

The shark alarm sounded and swimmers cleared from the water.

Bondi Lifeguards patrolled the area on jet skis and boats until it swam away.

A NSW Police spokeswoman said the PolAir helicopter was flying in the area at the time when the crew saw a shark and alerted lifeguards.