On Sunday, May 28, Venetians discovered that a stretch of the Italian city’s Grand Canal had turned fluorescent green. What is causing this sudden color change? The police, alerted by the inhabitants, announced to open an investigation. His first hypothesis is that of an awareness-raising action by environmental activists, echoing a similar episode that occurred in 1968 in Venice.

The color change was reported by locals, according to Veneto region president Luca Zaia on Twitter. “The prefect has called an urgent meeting with the police to investigate the origin of the liquid,” he added.

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According to local daily La Nuova Venezia, police are investigating whether climate change activists could be behind the phenomenon. The firefighters announced that they would help the regional environmental protection agency to take samples for analysis.

It is not the first time that the Grand Canal has turned green. In 1968, Argentinian artist Nicolas Garcia Uriburu dyed his waters green using a fluorescent dye during the 34th Venice Biennale, as part of an action to raise awareness of ecology.