    Sentence’ 4; Israel:'s defénsé: minister ‘on Sunday.  | ‘ised the specter of an Israeli invasion in the Gaza  Strip, where Palestinian militants “already: face ‘a  ‘deadly air carnpaign ,    Sentence 2: Shaul Mofaz , Israel 's Defence Minister,  raised, the prospect ofa ground ‘offensive into the  Gaza Strip , in addition’to ‘a growing air-campaign to  assassinate Hamas militants .         