Protesters disrupted Republican vice presidential candidate Paul Ryan on Monday, briefly forcing him to halt his first campaign speech alone since Mitt Romney named him as running mate.

A small group of women demonstrators at the front of a large pro-Ryan crowd chanted "Stop the war against the common good" as the Republican addressed the Iowa State Fair.

In chaotic scenes, one of the women rushed onto the small stage and was grabbed by three Iowa state troopers. Police said one of the protesters "punched a volunteer" at the event.

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