Police have searched the luxury cliff-top mansion of Kings Cross nightclub owner John Ibrahim on Tuesday afternoon, with his lawyer insisting the "sustained harassment" from authorities is unwarranted.

Police searching John Ibrahim's home. Credit:Seven News

The swoop at the Dover Heights home in Sydney's eastern suburbs started on Tuesday morning and involved officers from Operation Odin and sniffer dogs.

NSW Police detectives served Mr Ibrahim with a firearm prohibition order, a special power allowing police to search the home or car of a target deemed unfit to possess a gun without a warrant.