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(CNN) --

An Australian photographer has filed a police report against Taylor Swift's father, Scott Swift, for allegedly punching him as the superstar left a post-concert party in Sydney in the early hours of Tuesday.

Photographer Ben McDonald, 51, told CNN he learned the singer was aboard a yacht in Sydney Harbor after her last show in the city on Monday night.

He claimed that when Swift got off the boat, a security guard put an umbrella in his face and the camera, before being punched by the star's 71-year-old father.

Swift's environment was "aggressive and unprofessional," he said.

In a statement to CNN, Swift's spokesperson claimed that threats had been made against a member of her staff.

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"Two individuals aggressively pushed their way toward Taylor, grabbed her security staff and threatened to throw a female staff member into the water," the statement said.

New South Wales Police said they are investigating an alleged assault involving a 51-year-old man and a 71-year-old man at Neutral Bay Wharf at 2:30 a.m. local time.

Neither required medical treatment, police said in a statement.

Swift performed in Sydney and Melbourne for the Australian leg of her global “Eras Tour,” continuing her concert series in the Asia-Pacific region;

In early February, she performed in Tokyo and is scheduled to perform in Singapore in March.

Taylor Swift