UPDATE 3-Hyatt says data breach hit 250 hotels since August
(Adds number of affected hotels)
Jan 14 (Reuters) - Hyatt Hotels Corp said a previously reported malware attack to steal payment card data affected 250 hotels between August 13 and Dec. 8.
The hotel operator listed affected locations worldwide and the period when they were at risk, on its website. (bit.ly/1mhTUu8)
"We do not know the number of customers affected at this time," company spokeswoman Stephanie Sheppard said in an email.
Hyatt said on Thursday it identified unauthorized access to data on cards used at certain Hyatt-managed locations, primarily its restaurants.
The company also said the "at-risk window" for a limited number of locations began on or shortly after July 30.
The malware was designed to collect data such as cardholder name, card number, expiration date and internal verification code, the company said.
Hyatt said it has notified the appropriate country and state regulators and is working with the U.S. Federal Bureau of Investigation.
Shares of Hyatt closed down 3 percent at $38.67. Up to Wednesday's close, they had lost about a fifth of their value since the data breach was announced. Continued...