there is one other option, send in the military!
From other things I have read, the option to send in the French military is not that strong on the table.
(1). The French regulars are about 24% muslim.
(2). The French authorities are of the mind that sending the military will up the ante, (yes, this is appeasment thinking).
(3) The French government fears world opinion should they resort to sending the military in at this time.