"A slight uptick: 45 to this date last year, 48 to this date this year," said Eric Barnhart, Special Agent in Charge, FBI Salt Lake City Division.
Barnhart said most serial bank robbers aren't connected, but nearly all of them have something in common.
"We estimate, at least in our area of responsibility - Utah, Idaho, Montana - we believe about 97 percent are drug-related. So that can up, obviously, the volatility, the danger. People aren't thinking right. They're not acting right. They're obviously robbing banks to feed that drug addiction," Barnhart said.
The FBI's Wanted Bank Robbers web page contains information on hundreds of unsolved bank robberies. Members of the public can view https://bankrobbers.fbi.gov or use the "FBI Bank Robbers" smartphone app to learn more about various bank robberies still under investigation.