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Foxygen were forced to stop a gig in Minnesota on Monday night when their singer fell over and injured his leg during the show's opening song.
The indie rock duo had to cut their performance short after singer Sam France slipped and fell into a barricade positioned at the front of the stage.
An ambulance quickly arrived at the concert's venue, taking him to hospital with a suspected broken leg.
The band later tweeted "Sorry Minneapolis - we will make it upto you, we promise!! Sam is ok - he might have broken his leg."
There has been no news whether the band can continue with their future shows.
Below: watch Foxygen's 'San Francisco video