Update: US authorities open probe into SolarWinds' cyber breach - a podcast by BBC World Service

The US Securities and Exchange Commission (SEC) has begun the inquiry into last December's cyber attack on the IT provider, media reports say. It will ask whether some companies failed to disclose they had been affected. Our technology correspondent Rory Cellan-Jones explains the story.
And Peter Jankowskis, independent market analyst, brings us up to date on the day's activity on Wall Street.

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