( CNN ) -- A shark bit a 16-year-old boy across both legs as he was surfing in Hawaii on Sunday , CNN affiliate KHON reported . The attack came four days after a shark severed the right arm of a German tourist while she was snorkeling . In the Sunday incident , the teen was surfing in Pohoiki Bay when an 8-foot gray shark attacked him , the affiliate reported . He was taken to a hospital , but his condition was not known . Authorities brought in helicopters to survey the area for sharks , but were unsuccessful . Shark found on New York subway car . Shark attack claims Brazilian teen 's life . This shark attack is the fourth in the last month , and 9th for the year in Hawaii , the affiliate said . Last year , Hawaii had 11 shark attacks . While shark attacks have been on the uptick in recent years , according to the University of Florida , the fatality rate in the United States is just 2 % . Discovery Channel defends dramatized shark special . Best places to swim with sharks .
This is the fourth shark attack this month . The first was in January when a man on his way to work at an office building near the beach was attacked by two great white sharks.