The release of more than two dozen barges Friday on the Ohio River has sparked safety concerns on the extensive waterway this weekend. A number of bridges have been closed in response to the riverine event, according to NBC News. As of Saturday, authorities remeained unsure why the 26 barges had broken free, according to The New York Times. Pittsburgh authorities indicated that 23 of the barges were carrying dry cargo such as coal when they broke loose. Three of them are empty. According to the Pittsburgh Fire and Police Department, 26 barges—most of them loaded with dry cargo, like coal—broke…