Thieves stole an undisclosed number of Hall of Famer Yogi Berra's World Series rings and two of his MVP plaques from the Yogi Berra Museum and Learning Center in Little Falls, N.J.
Burglars broke into the museum on Wednesday, taking a number of Berra's record 10 World Series rings -- officials did not say how many, it was reported by multiple outlets. Berra was the American League Most Valuable Player in 1951, '54 and '55
The museum is housed inside the Montclair State University baseball stadium, which also bears the name of the legendary Yankees catcher.
No arrests have been made, according to reports, and a $5,000 reward has been posted. According to a New York Daily News source, the burglars were "a team of professionals." State and federal authorities are involved in the search for the memorabilia.
"This is very unique material and it would have to stay underground," Rob Lifson, a sports memorabilia expert, told the Daily News. "These are not mass-produced items -- it's like trying to sell a famous painting. Anyone who bought them would have to keep it secret. Why not just steal the Mona Lisa and try to sell that instead?"
Anyone with information regarding the robbery should call Det. Dean Cioppa in the Passiac County Prosecutors Office at 973-837-7667.
Joey Nowak is a reporter for MLB.com. Follow him on Twitter at @joeynowak. This story was not subject to the approval of Major League Baseball or its clubs.