In the complaint filed on behalf of the union, South Canara District Central Co-operative (SCDCC) Bank Employees Union office-bearer Chandraprakash said the bank official summoned him to his chamber and gave the murder threat since the union was raising the alleged irregularities in the bank.
City police commissioner M Chandra Sekhar said that legal opinion would be sought before registering a first information report on the basis of the complaint.
The Income Tax officials had conducted a search in the bank last month following the reports.