March 2 (Reuters) - UK's competition regulator on Monday said it was probing whether hotel chains Hilton HLT.N, InterContinental Hotels IHG.L and Marriott MAR.O were sharing competitively sensitive information via CoStar's CSGP.O hotel data analytics tool.

The Competition and Markets Authority said all four firms were under investigation.

(Reporting by Prerna Bedi in Bengaluru; Editing by Mrigank Dhaniwala)

((Prerna.Bedi@thomsonreuters.com; +91 98052 24616;))