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The Tokyo Stock Exchange plans to resume normal operations Friday after it halted trading for the entire day Thursday owing to what it said was a malfunction in its computer systems — the worst such outage ever.

There was no indication that the outage at the world’s third-largest exchange resulted from hacking or other cybersecurity breaches.

“We are extremely sorry for the troubles we have caused,” Koichiro Miyahara, president and CEO of the exchange, told reporters late Thursday.

The exchange issued a statement later saying it would open as usual Friday. It said it foresaw no problems with resuming trading.

Miyahara and other exchange officials said a computer hardware device they called “Machine 1” failed, and the backup, “Machine 2,” didn’t kick in, so stock price information was not being relayed properly.

The officials characterized the problem as a memory malfunction.

They said that rebooting the system during a trading

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Trading in Tokyo’s stock markets, which are among the world’s biggest, was halted for the whole day Thursday after the system was hit by one of its worst ever glitches.

A technical problem involving the delivery of market information was flagged to the operator of the Tokyo Stock Exchange operator and business was stopped less than half an hour before the opening bell.

The decision not to open for the rest of the day was taken around noon, with Japan Exchange Group giving no further details on the cause.

“TSE has decided to halt all listed stocks for all of today. When trade will resume has not yet been decided,” it said in a statement, which added that a decision on whether to resume Friday will be announced later.

The glitch hit the country’s top Nikkei 225 and Topix indexes as well as exchanges in Nagoya, Sapporo and Fukuoka that

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