London, July 7 : Madonna left fans waiting for more than half an hour at her recent London concert, as the venue''s air conditioning was not "a certain temperature".

The Queen of Pop restarted her Sticky and Sweet world tour in the British capital with her performance at the O2 Arena on July 4.

The singer left fans booing and jeering as the concert was delayed over the air-conditioning, leaving some of them stranded after the show as London''s public transport systems shut for the night.

A spokeswoman for the 20,000 capacity venue issued an apology over the delay.

"Madonna unfortunately came on stage much later than we expected. Madonna requested the arena be a certain temperature - the air conditioning was turned on an hour before Madonna came on stage," the Daily Star quoted her as saying. (ANI)