Jago said witnesses spotted one or two other large sharks circling at the time of the attack, but that no sharks have been seen in the area since then.
Clinton Duffy, a shark expert with the Department of Conservation, estimated that only 12 to 14 people have been killed by sharks in New Zealand since record keeping began in the 1830s.
Around the world, sharks attacked humans 80 times last year, and seven people were killed, according to the University of Florida's International Shark Attack File. The death toll was lower than it was in 2011 but higher than the average of 4.4 from 2001 to 2010.
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