Two men were seriously injured Saturday in separate shark attacks off the Hawaiian island of Oahu, authorities said. Shortly before noon, a 44-year-old man was injured after what appeared to be a shark attack in the waters off Lanikai beach in Oahu, AP reported. The victim and another man, whose age is unknown, were swimming to shore from the Mokulua Islands when the shark attacked. The attack happened about 50 to 100 yards (45 to 90 meters) from shore, the Honolulu Fire Department said. The victim was injured in his lower legs, but the other man did not sustain any injuries. Two nearby kayakers paddled the men back to shore, where Hawaii Fire Department staff and paramedics treated the victim. He was taken to the hospital in serious condition. Authorities notified swimmers and cleared Kailua, Lanikai, and Mokulua beaches. About 7:20 p.m., a shark bit a 32-year-old man's left foot as he was in the water off Waikiki beach. The man is in serious condition at a nearby trauma center.