Macau’s Health Bureau has launched an investigation into Wynn Macau’s possible breach of the city state’s smoking ban, following reports that the casino resort failed to post “no smoking” signs in an area inside its casino.

In a statement, the bureau said it received a complaint that Wynn Macau was not complying with a 2012 government-approved blueprint, which showed customers where they can smoke in a casino. The complaint prompted a joint inspection by the Health Bureau and the Gaming Inspection and Coordination Bureau, who found that “the casino joined some smoking areas (VIP rooms) and non-smoking areas (corridors) with no clear separation between them,” according to the bureau.

The non-smoking areas, which were connected to the VIP rooms, also had no “no smoking” signs in them.

The bureau has already notified Wynn Macau about the possible violation and assured it would follow up the case. If found guilty, the casino operator faces a fine from MOP10,000 (USD1,250) to MOP100,000.