Hilton hotels hit by cyber attack

US hotel chain Hilton revealed Tuesday that hackers stole credit card information from some of its point-of-sale computer systems. Hilton did not reveal the extent of the breach, but warned anyone who used credit cards at Hilton Worldwide hotels between November 18 and December 5 of last year or April 21 and July 27 of this year to watch for irregular activity in their accounts. Information swiped by malicious code that infected systems included credit card holders' names along with card numbers