It is believed the girl, from Perth, was riding jet skis with friends on the river when the incident happened. Insp Paul Robinson, from Western Australia Police, said it was possible the girl had jumped in the water to swim with dolphins seen nearby. Fisheries experts say it is unusual to find sharks in that part of the river, Mr Robinson said. This is believed to be the first fatal shark attack in the Swan River since a 13-year-old boy was killed in January 1923. Australia typically records about 20 shark attacks each year, with most in New South Wales...