SINGAPORE - Within hours after general tickets sales starting on Thursday (Oct 19) for Bruno Mars' Singapore Indoor Stadium concert on May 6, scalpers have already started appearing on ticket sites such as Carousell, Viagogo and Craigslist at inflated prices.

This is despite organisers Live Nation Lushington announcing a second show on May 7, in addition to the May 6 show. But tickets for both shows have been sold out.

For instance, one user is reselling a pair of Category 1 tickets, that cost $348 originally, at $1,500 per ticket on Carousell. Tickets for the show purchased via the official channel of Sports Hub Tix range in price from$168 to $348.

Since official ticket sales kicked off at 10am on Thursday, Live Nation Lushington has continued to release additional tickets with restricted views for both the May 6 and 7 shows.

The May 6 show now has "side view" seats for $168 on the left and right side of the stage that "may have an obstructed view of the main stage's rear central screen".

At around 11.50am, organisers also announced a new category 10 and 11 "rear view" seated tickets for both show days. Priced at $168 and $248, they are situated on the left and right side of the main stage and "may have an obstructed view of the main stage's rear central screen as well".

Organisers added: "We would also like to urge fans to refrain from purchasing tickets through unauthorised resellers as these tickets may be voided and holders will be denied access to venue."

The shows next year are part of his Bruno Mars - 24K Magic World Tour, that includes dates in North America, South America, New Zealand and Australia.

It will be his second outing in Singapore after he last performed at the same venue in 2014.