Waterloo Police are investigating a stabbing that happened in the early morning hours of Sunday, according to the Waterloo Cedar Falls Courier. Shortly before 3:00 a.m. a woman arrived at MercyOne Waterloo Medical Center suffering from stab wounds. Not long later a man arrived also suffering from stab wounds, his to the arms and back. The woman was treated and released. Police believe this was part of a domestic dispute. No other details have been released at this time.