Trouble-hit Mizuho Bank resumed operation at most of its ATMs on Tuesday morning after fully suspending them for three days due to large-scale computer system malfunctions.

Deposit and withdrawal services became available at ATMs at Mizuho branches at 8 a.m., and the transfer service resumed both at ATMs and over the counter at noon. Operation of its ATMs in convenience stores also restarted at midday.

Although the bank kept the transfer service halted in the morning to reduce the load on computer systems, the confusion arising from the suspension abated, Mizuho officials said.

It also proceeded with the transfer of some ¥509.6 billion in about 890,000 transactions that should have been processed between March 15 and Friday, including ¥125.6 billion in 620,000 payroll payments, to enable customers to confirm money received during the day, they said.

Customers were still unable to withdraw or deposit money at 2,175 ATMs installed outside bank branches throughout Tuesday.

Most services, excluding handling foreign currency deposits and some other services, were expected to be restored Wednesday.