Mysterious Green Water Appears in Venice Canal

Police in Venice are investigating the source of a bright green liquid patch that appeared on Sunday in the city's Grand Canal. The substance has sparked a range of theories, with some speculating algae growth and others pointing the finger at environmental activists. The Vogalonga rowing regatta, which aims to celebrate the Venetian lagoon environment as well as to protest wave motion from excessive motorboat traffic that riles the city, took place over the weekend.