TOKYO (AP) — Executives at a leading Japanese bank apologized and took pay cuts on Thursday after police arrested an employee who allegedly stole about 1.4 billion yen ($9 million) worth of valuables from customers’ safe deposit boxes. The thefts at two branches of MUFG Bank spanned four years and were uncovered last October.

The bank is also strengthening its safe deposit box checks and procedures. Five senior executives of MUFG, including its board chairman and CEO, are taking up to a 30% pay cut for three months following an incident where an ex-employee stole from safe deposit boxes.

Yukari Iwamura was arrested after she allegedly stole valuables including gold bars from the safe deposit boxes of customers.