Stenovitch was charged with assault Monday and released on his own recognizance. His phone number is unlisted.
Kennedy says the attack was unprovoked. Gannon was treated for a broken nose.
State Police Maj. Elwood M. Johnson Jr. says Stenovitch has been placed on administrative leave pending the results of an internal investigation.
Hundreds of officers had gathered to raise money for the wife of Providence police Officer Peter Rocchio, who died in a June car crash.
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