Chicago River glows green as city prepares to celebrate St Patrick’s Day
The Chicago River has been dyed green for St Patrick's Day in a 61-year-old tradition.
Timelapse footage shows luminous dye being poured into the water on Saturday, 11 March, as part of the city's celebrations of Irish culture.
Other festivities, including the South Side Irish Parade, were held the weekend before the official cultural date.
The tradition began in 1962, when members of the Chicago Journeymen Plumbers Local Union dumped 100lb (45kg) of dye into the river.
Click here to sign up for our newsletters.