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Online brokerages, such as SBI Securities and Rakuten Securities, reported delays in price data feeds and other system glitches.
NTT Docomo (OTC:DCMYY), the mobile phone arm of Nippon Telegraph and Telephone (OTC:NPPXF), said some of its services were also affected.
The largest airline company, ANA Holdings, said some flights were delayed after a temporary outage hit its ticketing and check-in system, though it was later restored.
An Amazon spokesperson said the company was working to restore its system, but declined to comment on how many customers were affected.