The Financial Services Agency filed a criminal complaint against UFJ Bank and three former executives Thursday over their attempts to block inspections by concealing documents and refusing to answer questions, the bank regulator said.

The FSA also ordered the bank's Tokyo and Osaka corporate business sections to cease new lending operations to corporate clients for six months, beginning Oct. 18.

The criminal complaint, filed at the Tokyo District Public Prosecutor's Office, is the latest blow to beleaguered UFJ Holdings Inc., the object of a merger battle between the Mitsubishi Tokyo Financial Group Inc. and the Sumitomo Mitsui Financial Group Inc.