But the gurgling and being the worst sounds right. And they were Muslims. Worst I've seenThe Dagestan Massacre was happened in 1999, then even ISIS did not exist only in the same year it was established but in Syria and not in Chechnya
The Dagestan massacre was carried out by Chechen Mujahideen on 6 Russian soldiers
The murderers was cruel and they were islamist paramilitary and Chechen military rebels, not members of any arabian terrorist organization

