The singer had invited people on stage after a crowd surfer had been pulled down.

Shortly after, the frontman was surrounded by audience members — some holding “Bernie” signs — as well as multiple police officers, who were seen ushering people off the platform when the song finished.

Erika Mantz, a spokesperson for the University of New Hampshire, whose police department managed the event, said: “Contract security asked police to help control crowd access to the stage and performers.”

The Strokes were playing at a rally for Bernie Sanders, who introduced the band to his campaign event in Durham, New Hampshire.

Casablancas said before the concert: “As the only truly non-corporate candidate, Bernie Sanders represents our only chance to overthrow corporate power and help return America to democracy.

“This is why we support him.”

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