British rock band Coldplay's upcoming tour of India has triggered a police investigation and dismayed fans after scalpers bought up cheap tickets to resell online for more than $1,000 a piece.

Thousands of music fans tried and failed to buy tickets for three concerts scheduled in financial hub Mumbai next January, sold by popular Indian online ticket portal BookMyShow. 

All three shows sold out in minutes, and those who missed out were infuriated when they saw $70 (6,000-rupee) tickets appear on resale websites at vastly inflated prices.

"The tickets are being sold at 10 times, 20 times, 30 times the price that is being sold on the website itself," student Anna Abraham, 19, told AFP. 

"I wouldn't feel good about it myself if I knew that I paid for something 30 times more than what I could have paid for."

Local media reports said BookMyShow's chief operating officer was questioned by police Monday after a complaint brought by Mumbai lawyer Amit Vyas, who claimed the vendor was working with "black marketeers" to make an extra windfall on ticket sales. 

"I checked with nearly 100 people who I know are regulars at concerts, none of them had gotten a ticket," Vyas said, according to the Indian Express newspaper. 

"This made me suspicious. I then decided to approach the police as I knew that something was amiss."

BookMyShow issued a statement after the public backlash began last week, saying it had "no association" with unauthorised ticket selling. 

"Scalping and black marketing of tickets is strictly condemned and punishable by law in India and BookMyShow vehemently opposes this practice," the company said. 

Controversies surrounding tickets for major international musical or sporting events are not new.

US megastar Taylor Swift lashed out at Ticketmaster in 2022 following fan anger over sales to concerts staged for her globe-spanning 'The Eras Tour'.

The debacle sparked debate over the Ticketmaster’s privileged position in the industry amid fan complaints of hidden fees, rampant ticket scalping and limited tickets due to presales.