This week is Lightning Safety Awareness Week, which began in 2001 "in order to call attention to lightning being an underrated killer," according to the National Weather Service. So far this year, there have been four reported deaths from lightning strikes in the U.S., according to the National Lightning Safety Council. ????? ???????

Dominion Beach Park is expected to reopen on Wednesday "following safety assessments and clearance from authorities," Lexington County officials said. ????????????  

Several people had swam out to the buoys and were holding the cable when the lightning hit, with others nearby in the water, the fire district said. ?????  

When the strike occurred, it was a "bright and sunny day" at the lake, but then a bolt of lightning hit the water and "energized a metal cable with buoys on it that surrounds the swimming area," the Irmo Fire District said in a statement. ????? ???????  

Eighteen of those individuals were treated at the scene, while 12 were sent to three local hospitals with non-life-threatening injuries, Vanessa Diaz, the public information officer for Lexington County, told ABC News in a statement. ????????????