Mercenaries are mercenaries. And Religiously Motivated ones are the most dangerous ones. Unfortunately this has been made a norm in our country.
Our citizen have been fighting over all countries where ever their ULAMA want them to fight.
It has been going on for decades now Afghanistan, Chechnya, Balkans etc.
Government never stopped them or took any important step to stop them. And even in Syria, before this, many Pakistanis have gone to fight from the side of opposition from 2011 on wards to fight the NUSEYRI REGIME when Turkey,Iran,Russia were not even involved. Nobody ever rose an eyebrow because all those fighters were fighting wars against countries that were not our diplomatic allies. Now after seeing this may be our government will clap down these zealots and their Mullahs to stop them to fight other people wars and die for some one else instead of contributing to their own country.