Deloitte hit by cyber attack, says 'very few' clients affected

Global accountancy firm Deloitte said on Monday it had been hit in a cyber attack that had compromised the data of a small number of its clients but gave few details about how its systems had been breached.

Attackers had accessed data from the company's email platform, the company said in a statement, confirming a report by the Guardian newspaper.

Deloitte, one of the "big four" accountants, said it had mobilised a team of cyber-security experts to review its systems and to discover what information had been put at risk.

It said the review had found "only a very few clients" had been affected.

"No disruption has occurred to client businesses, to Deloitte's ability to continue to serve clients, or to consumers," a spokeswoman said in a statement.

The firm, which provides auditing, tax advice and consultancy to multinationals and governments, did not say when the attack occurred or how its defences had been breached.

The Guardian said the firm discovered the hack in March, but the cyber attackers could have had hacked into its systems as long ago as October or November 2016.
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