Venice's Grand Canal turns fluorescent green, authorities investigate.

The waters of Venice's Grand Canal turned fluorescent green on Sunday, prompting an emergency meeting by the Interior Ministry's representative in Venice to devise possible countermeasures. The regional environmental protection agency is investigating the cause of the change in color, which is believed to have been caused by a type of dye often used to trace water leaks. The liquid did not pose a threat to the health of local residents, according to police.