Investigation Launched as Venice's Grand Canal Turns Fluorescent Green

A patch of water in Venice's Grand Canal turned fluorescent green, prompting an investigation involving police, the regional environmental agency, and other local bodies. The initial analysis suggested that there were no harmful substances in the water, and more tests will be conducted. The regional environmental agency suspects that fluorescein, a powdered dye that can be diluted in water, had been used, possibly by an environmental group. Venice is one of the world's most fragile cities, threatened by rising sea levels, and has instituted stringent rules for tourists to preserve the environment.