Dance music star Moby has hit out after a female friend of the star was tackled to the ground in a security mix-up at the Democratic National Convention.

The musician flew out to Denver, Colorado this week for the historic event, joined by a bevy of celebrities and politicians who prompted tight security.

He says, "A friend of mine was wrestled to the ground by six cops/security-people because she had left her credentials in her hotel room. Maybe the cops in Denver should lay off the caffeine/meth/diet-pills/sugar-cereals while they're working the convention?"

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(This news article provided by World Entertainment News Network)