People who follow the news would automatically say, 10,000. They would have good reason to believe that;
the magic number of '10,000 prisoners' is used as received wisdom by Arabs, left-wingers and the news media as fact.
For example:
Daoud Kuttab, quoted in the NYT, November 2009: 'Israel is holding more than 10,000 Palestinians, some without charge or trial. '
MJ Rosenberg in HuffPo, November 2009, headline: 'Gilad Shalit's Counterparts: 10,000 Palestinian Prisoners In Israeli Jails'"
