The London Stock Exchange has been working with British security services to investigate cyber attacks against it, that may have led to the postponement of a transfer to a new trading technology platform until February 14, according to a report in the Times of London.

Security officials in the United States also are investigating a cyber-attack on an American exchange, that the Times did not name. That attack was traced to Russia. "Unusual" trading patterns at New York and Chicago platforms also are under scrutiny, the news publisher said.

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