CANASTOTA, N.Y. -- Investigators into the theft of six championship belts from the International Boxing Hall of Fame said last week they believe the heist -- the biggest theft of boxing memorabilia ever -- was committed by one or more highly skilled professionals.

"Based on the speed [and] based on the manner in how this occurred, it's definitely a professional," Canastota Police Chief James Zophy told The Huffington Post.

Zophy said the theft was well-planned and well-executed.

"It was done very, very meticulously and it was done very quickly and that's not typically what we see," the police chief said.