There is a webpage about POW Camps in the Canal Zone in Egypt. There were PW in Eguypt until the end of 1948. Initilaly repatriation was slow because the auithorities were reluctant to lose manpower, then there was a shortage of shipping.
http://www.canalzoners.co.uk/POW%20Camp ... 20Egyt.htm
As there was nowhere to run, there were no reported escapees but the POW’s were subjected to raids on the camp now and again by local terrorists driving round the perimeter fence in old cars and trucks, firing a few shots and then making off in a cloud of dust. No one ever got hit, in fact no one really too much notice.
This does not sound like the Stern Gang.