KAAAWA (KHNL) -- A possible shark attack happened off of Kahana Bay State Park shortly after 5 p.m.
Paramedics say a man, possibly in his 40's, was surfing when a shark bit him on his thigh and leg.
"It was apparently a massive injury to the back of the leg, thigh and calf area," said Honolulu Fire Department Captain Robern Main.
Officials say he was able to paddle himself back to the beach. His surfing partner helped bring him to shore and helped him control the bleading until paramedics arrived.
Paramedics took the man in serious condition to the Queens Medical Center.
Fire officials say ocean safety and firefighters are at the scene, clearing people out of the water. Then they headed out to search for the creature involved in the attack.
"They've been searching the area for any kind of predatory animal. We did happen to find a lot of turtles and common sense will tell you that when there's a lot of turtle, there's going to be something that feeds on them," said Capt. Main.