Actaully yes, here's their statement:

For centuries the Amazon has been home to the most ferocious fresh-water monsters known to man...piranhas. Now, these deadly creatures are appearing in US lakes and rivers. The MonsterQuest team investigates whether these carnivorous beasts could breed here and devastate our waters.

I truly believe the videos....here is one that really made me believe http://tinyurl.com/yfldc3q