A number of Backstreet Boys fans have been injured while queuing for a concert in Oklahoma.

Severe weather conditions caused a structure to collapse on top of fans who were waiting to see the band outside the WinStar World Casino and Resort in Oklahoma.

Fourteen fans were injured and taken to local hospitals.

Singer Nick Carter tweeted that he was "praying for our fans that were injured".

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His bandmate Kevin Richardson referred to the structure as a "tent" and tweeted before the band's Saturday show that severe weather had passed through Thackerville causing the metal structure to come down.

WinStar released the following statement to ET: "All patrons in the area were asked to move and to seek shelter from the storm. However, about 150 patrons who were standing in line for the Backstreet Boys concert did not heed staff's warning … the storm hit and knocked over the concert entrance trusses with 70-80mp/h winds and heavy rain. 14 people were treated at the scene and then transported to local hospitals. Two have already been released."