Winter scenes from Niagara Falls

Pieces of ice flow over the Horseshoe Falls in Niagara Falls, Canada.  (Aaron Lynett / Associated Press)

Masses of ice form in the lower Niagara River and around the American Falls as seen from Niagara Falls, Canada.  (Aaron Lynett / Associated Press)

Visitors Rosalie Vissers, left, and Rachel Houter take a photo near masses of ice formed around the Canadian Horseshoe Falls in Niagara Falls, Canada.  (Aaron Lynett / Associated Press)

Masses of ice form around the Canadian Horseshoe Falls as seen from Niagara Falls, Canada.  (Aaron Lynett / Associated Press)

Niagara Falls State Park visitors look over masses of ice formed around the American Falls.  (Aaron Lynett / Associated Press)

Pieces of ice flow over the Canadian Horseshoe Falls.  (Aaron Lynett / Associated Press)

Masses of ice form in the lower Niagara River and around the American Falls.  (Aaron Lynett / Associated Press)

Masses of ice form in the lower Niagara River and around the American Falls.  (Aaron Lynett / Associated Press)

The sun rises over the Horseshoe Falls.  (Aaron Lynett / Associated Press)