Milan, May 28 (AP) Police in Venice are investigating the source of a phosphorescent green liquid patch that appeared Sunday in the city's famed Grand Canal.

The governor of the Veneto region, Luca Zaia, posted a photo of the green liquid that spread through the water near the arched Rialto Bridge.

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The patch was reported by residents.

Images on social media show a bright patch of green in the canal along an embankment lined with restaurants.

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Zaia said that officials had requested that the police investigate to determine who was responsible.

Environmental authorities were also testing the water. (AP)

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