悪条件[akujouken] unfavorable conditions
暗殺事件[ansatsujiken] assassination
案件[anken] matter in question
一件[ikken] matter

怪事件[kaijiken] mystery case
基本条件[kihonjouken] basic conditions
刑事々件[keijijiken] criminal case
件数[kensuu] number of events (e.g. accidents, crimes, meetings, housing starts, hits on a web page)