SYDNEY, Australia — A female swimmer was seriously injured in a shark attack in Sydney Harbor and taken to the hospital in stable condition, authorities said Tuesday.

Emergency services were called to a private wharf in Elizabeth Bay on Monday evening and found a woman, believed to be in her 20s, with “a serious injury” to her right leg, police in the state of New South Wales said in a statement.

Police said they had been told the woman was swimming off the wharf when the shark attacked her. The incident happened about 60 feet from the jetty, media reported, citing residents.

While shark sightings along Sydney’s ocean-facing beaches are common, attacks in its iconic harbor are rare. The incident on Monday took place near the Opera House and Harbor Bridge.

“Shark bites are really rare … the last incident that occurred in Sydney Harbor was in 2009,” Amy Smoothey, senior shark scientist at the New South Wales department of primary industries, told the Australian Broadcasting Corp.

Based on the bite patterns and images provided, the woman was most likely attacked by a bull shark, Smoothey said.