cairo foreign fighter capture raid islamist militants blame egypt deadly attack western desert last month libyan national egyptian interior ministry say thursday capture fighter abdelrahim mohamed al-mesmari 25 eastern libyan town derna interior ministry statement say little-known group call ansar al-islam claim responsibility oct. 21 attack three security source say time least 52 police officer conscript kill interior ministry refute figure next day say 16 policemen kill new militant group risk open another front security force far beyond remote northern sinai battle islamic state insurgency since 2014. egyptian air force kill 15 militants responsible deadly attack late arrest 29 others adopt ideology statement say militants train derna add egypt say capture fighter involve deadly desert attack libyan