Chinese authorities have shut down the Asia Pacific Poker Tour (APPT) 2015 Nanjing Millions for as yet undetermined reasons.

The Nanjing Millions had gotten off to a roaring start, with player demand compelling the organizers to add an extra Day 1 flight. Over 2,300 players had registered for the event, which was supposed to conclude on Sunday. But the poker party ended abruptly Friday afternoon when local police shut the event down cold.

World Gaming Magazine reported that police had blocked the entrance to the Wutaishan Sports Center host venue. A notice pinned to the door indicated that the tournament organizers were “suspected of illegal gambling” and that “the event is being ceased.” WGM reported that the organizers’ office had been similarly locked down and that players had been left in the dark as to what exactly had transpired.

The Nanjing Millions had been feted as the latest move by PokerStars to reestablish itself on Chinese soil. PokerStars Macau had teamed with Beijing’s Star Poker Club to sponsor the event, much as they had on last year’s Beijing Millions and Beijing Cup events.