Palestinians fired a Kassam rocket at southern Israel overnight. The IDF responded by firing at Kassam launching sites, Israel Radio reported.More about:Israelfunction initServerVars() {_headup.clientHost = 'http://newstopics.jpost.com';_headup.termsFromServer = 'Israel';_headup.annotatedTerms = 0;_headup.widgetMode = 'snippet';_headup.snippetButtonStyle = 'banner';_headup.blackListedUrl = false;}