FILE PHOTO: The logo of global online travel brand Expedia is pictured at the International Tourism Trade Fair in Berlin, Germany, March 9, 2016. REUTERS/Fabrizio Bensch/File Photo

WASHINGTON (Reuters) – A group of U.S. state attorneys general are investigating Expedia Group and hotel chains like Hyatt Hotels Corp and Marriott International Inc for alleged violations of antitrust law in online travel booking, according to a court filing.

The filing in a state court in Utah relates to a dispute originally filed in Texas in which Travelpass accused the hotel chains last year of agreeing with each other, and with online travel groups like Expedia, to not advertise to consumers who searched for another company’s hotel.

This means, for example, that a traveler who searches online for