Global accountancy firm Deloitte has been hit by a sophisticated hack that resulted in a breach of confidential information and plans from some of its biggest clients.
Deloitte - one of the big four professional services providers - confirmed it had been hit by a hack, but it said only a small number of its clients had been impacted.
The firm discovered the hack in March, according to the Guardian, but the cyber attackers could have breached its systems as long ago as October or November 2016.
The attack was believed to have been focused on the US operations of the company, which provides auditing, tax advice and consultancy to multinationals and governments worldwide.
"In response to a cyber incident, Deloitte implemented its comprehensive security protocol and began an intensive and thorough review including mobilising a team of cybersecurity and confidentiality experts inside and outside of Deloitte," a spokesman said.
"As part of the review, Deloitte has been in contact with the very few clients impacted and notified governmental authorities and regulators."
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