They're not saying yet how many accounts are affected, but Yahoo has had an email security breach.

FOX News Radio's Rich Johnson reports from Washington:

There are about 273 million Yahoo mail accounts worldwide -- 81 million of them here in the U.S. The company says hackers went after names and email addresses in its users address books. That means anyone who knows someone with a Yahoo account might be vulnerable. That's because you're more likely to open a mail that appears to be from someone you know -- when it might be a scam message. And the even bigger danger: Hacking into email that might reveal your user names and passwords to banking and shopping sites.

In Washington, Rich Johnson, FOX News Radio.

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