The IRS said a new phishing email scam is targeting human resources and payroll departments at companies -- specifically going after personal information on employees' W-2 forms.

"The Form W-2 email phishing scam has evolved beyond the corporate world and is spreading to other sectors, including school districts, tribal organizations and nonprofits," the IRS said on its website.

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The scammers are said to be sending emails designed to look like they are coming from a top IRS executive. The emails ask for a list of all employees at the company or organization and their W-2 forms.

The IRS said these requests are fake and put the data of all workers at risk, adding companies should alert their workers about this scam and develop a formal policy about how to deal with the sharing of W-2 information.

"This is one of the most dangerous email phishing scams we've seen in a long time. It can result in the large-scale theft of sensitive data that criminals can use to commit various crimes, including filing fraudulent tax returns. We need everyone's help to turn the tide against this scheme," said IRS Commissioner John Koskinen.

The IRS said there have been nearly 30,000 victims already.

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