Hotel officials disclosed Friday that the hotel's four restaurants, along with its valet parking operation, may have been hacked at some time between April and December, disclosing names, credit card numbers and expiration dates printed on customers' debit and credit cards.

The Westin Bonaventure is in L.A.'s downtown financial district, near the Los Angeles Convention Center and the Staples Center.

"Guests who used or visited the affected businesses during the eight-month period and who used a credit or debit card to pay their bills directly to the restaurants and valet parking might have had such information compromised and are encouraged to review their statements from that time period," the hotel said.

The system that stores hotel guest information wasn't affected, the Westin said. It offered few other details, including whether any credit card data had been misused, and a spokesman for the company's public relations firm didn't immediately return a call Friday.

In a on its Web site, the hotel said its point-of-sale system may have been compromised by an outside hacker. It is offering a free credit monitoring service for customers who believe they were affected.