Helicopters dropped water on a fire that burned for hours on the top floors of an under-construction skyscraper in Moscow, Russia on Monday. The building will be, or would have been, the tallest building in Europe when complete, at a height of 1,150 feet. The fire burned for three hours on the top floors which had reached the 880-foot level during construction.
Two KA-226 helicopters dropped water on the fire. Wikipedia says a KA-226 can carry an external load of 1,500kg, which translates to around 400 gallons of water in a bucket.
Firegeezer has more details, including a photo of one of the helicopters working the fire.