A huge glacier broke off and plunged into a lake in Peru, causing a 75-foot (23-meter) tsunami wave that swept away at least three people and destroyed a water processing plant serving 60,000 local residents, government officials said on Monday.

The ice block tumbled into a lake in the Andes on Sunday near the town of Carhuaz, some 200 miles north of the capital, Lima. Three people were feared buried in debris.

Investigators said the chunk of ice from the Hualcan glacier measured 1,640 feet by 656 feet.