Water in Venice's Grand Canal turns bright green – video

Police in Venice are investigating the source of phosphorescent green liquid that appeared on Sunday in the city’s Grand Canal, amid speculation it was caused by climate protesters. Gondoliers could be seen punting through the phosphorescent waters while tourists took photographs of the green patch, from the Rialto Bridge up and along part of the canal. The Italian fire service said it was helping the regional environmental protection agency take samples for testing

• Venice police investigate source of bright green liquid in Grand Canal