Four more people charged in London St. Patrick's Day riot

London police say four more people have been charged in last month's St. Patrick's Day riot.

A total 42 people have now been charged, including 19 Fanshawe College students.

The latest to be charged range in age from 18 to 21.

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  Police are using social media to make more arrests on Monday, March 19, 2012 after a riot in London, Ont. on St. Patrick's Day.