A Rhode Island beach has been evacuated as authorities investigate reports from beachgoers of a boom in the sand that knocked a woman into a rock wall.

State Department of Environmental Management spokeswoman Rayne Maguire tells the Providence Journal (http://bit.ly/1HuqFr0) the woman was taken to a hospital from Salty Brine beach in Narragansett after the incident around 11 a.m. Saturday. No other injuries have been reported.

DEM enforcement Sgt. Thomas Silvia said authorities are looking for a suspect they believe planted something in the sand then fled.

A witness told the newspaper he heard a boom and saw the woman get knocked over a few feet from him. Mario Lewis of West Greenwich says he saw no debris or smoke.

State police and local police are investigating with a bomb squad.

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Information from: The Providence Journal, http://www.providencejournal.com