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Rapper Tone Loc collapsed on stage at a downtown Des Moines performance late Saturday, abruptly ending the show, attendees said.

The seriousness of the incident was not immediately apparent. It happened at the Bridge Bash, being held at the Court Avenue bridge over the Des Moines River.

Three Des Moines Register employees said Tone Loc finished a song, then went to the ground. People attended to him for about five minutes. Fans were asked to leave and the show was shut down.

Loc has had health issues during performances before: The celebrity news website TMZ.com has reported on collapses in 2012, 2011 and 2009 in Texas, Georgia and Florida. In two cases he was hospitalized.