Following previous works (Huang and Riloff, 2011;<cite> Huang and Riloff, 2012a)</cite> , we only consider the "String Slots" in this work (other slots need different treatments) and we group certain slots to finally consider the five slot types PerpInd (individual perpetrator), PerpOrg (organizational perpetrator), Target (physical target), Victim (human target name or description) and Weapon (instrument id or type).