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The Tokyo Stock Exchange stopped trading of derivatives on Tuesday morning, in the latest in a series of technological glitches that have embarrassed Japan’s largest exchange group.

The TSE blamed a broken router in its Tdex+ derivatives trading system, installed last November, which affected all trading of Topix futures, government bond futures and options for more than 90 minutes from about 9:20am local time. An automatic switch to a backup router failed, it said.

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