Lake tragedies hit at least two North Texas lakes Sunday as divers and emergency teams found two people dead in Lake Worth and searched for two other men who went missing in the water during the Labor Day weekend.Game wardens stressed to lake visitors to wear life jackets as the Labor Day holiday continues on Monday when thousands of boaters and swimmers head for area lakes.Fort Worth Fire Department divers were at Lake Worth Sunday afternoon searching for two men who were reported missing after going wading, a fire official said.Firefighters received the call of a possible drowning shortly before 7 p.m. Sunday in the 7400 block of Cahoba Drive, just north of Naval Air Station Fort Worth.MedStar reported that the males are 15 and 23 years old.Fire officials said three people went wading about 75 to 100 yards from shore.The 15-year-old who couldnt swim slipped off a ledge and went into about 12-foot of water, Fort Worth Lt. Carol Jones said Sunday. The teen panicked and his uncle went in to save him. He also didnt know how to swim and so they both went under. The third person wasnt injured.None was wearing a life jacket, authorities said.About an hour after emergency crews arrived, the drowning call turned into recovery efforts by the divers. The identities of the teen and his uncle had not been released.MedStar officials reported that the teen and his uncle were located more than an hour after they disappeared in the water.A game warden with Texas Parks and Wildlife said later Sunday that two men were missing at Lake Lewisville.A 33-year-old Mesquite man went missing Friday night after he fell off a party boat. Divers continued searching for Sunday.No one saw him go over, so we dont really have a good location to look, said Lt. Jennifer Kemp with Texas Parks and Wildlife.A second man went missing at Lake Lewisville on Sunday morning, Kemp said.The Frisco man was tubing with his son when the boy fell off the tube, authorities said. The boy was wearing a life jacket, and the father was swimming toward his son to retrieve him when he went down in the water and never resurfaced.Teams are searching for the Frisco man near the central area of the lake.