Accra,(Greater Accra) 24 Oct. The Israeli government is to expel all illegal immigrants by December 16, the Ministry of Foreign Affairs said today. An official statement issued in Accra advised the public to be ''extremely wary'' of those who promise to procure for them Israeli visas and employment at exorbitant prices. ''Invariably, those promises land unsuspecting law-abiding immigrants, such as those the Israeli and many other governments are now expelling.''