The remainder of the William Hill World Darts Championship will be played behind closed doors at London's Alexandra Palace.
The sport's biggest tournament had begun on December 15 with fans for just one night before London was placed into Tier 3 restrictions by the UK government, meaning that play continued behind closed doors.
That had been due to be reviewed on December 23, however with London since being moved into Tier 4 restrictions, it will now not be possible for fans to attend for the remainder of the tournament.
Fans who had purchased tickets for sessions from December 27-January 3 will receive a full refund from SeeTickets back to the payment card used for the original transaction.
The World Championship's second round will conclude on Wednesday December 23 ahead of a three-day Christmas break, before returning on Sunday December 27.
Play will continue through to Wednesday December 30, before concluding from January 1-3 with the quarter-finals, semi-finals and final.
Global coverage will be headlined by coverage on the dedicated Sky Sports Darts channel, while the PDC's international broadcast partners will include RTL7 in the Netherlands, DAZN in various territories, Fox Sports in Australia, Sky Sport in New Zealand, PDCTV for Rest of the World Subscribers and at matchroom.live.