This highly autonomous , small ( probably only 20 to 50 members at any given time ) group was first founded and led by Shamil Basayev under the name of '' ' Riyadus Salihiin Reconnaissance and Sabotage Battalion of Chechen Martyrs ' '' ( later also known as '' ' Islamic Brigade of Shaheeds ' '' ) in October 1999 as a " special battalion to carry out acts of sabotage " in retaliation for the Grozny missile attack . Basayev took responsibility for a series of suicide attacks in Chechnya and Russia , including the truck bombing which destroyed the Chechen Republic 's government headquarters in Grozny and killed over 80 in 2002 , the truck bomb attack at Chechnya 's FSB headquarters in Znamenskoye which killed more than 50 in 2003 , the truck bomb attack at a Russian military hospital in Mozdok , North Ossetia , which killed at least 50 the same year , and a series of " Operation Boomerang " suicide bombings ( many of them conducted by women ) which have killed over 200 civilians in Moscow and elsewhere in Russian heartland , including 90 killed in the simultaneous aircraft bombings over two Russian regions in 2004 . Riyad-us Saliheen also took responsibility for the involvement in the hostage crises in Moscow in 2002 and Beslan in 2004 , which together have resulted in more than 500 hostage fatalities . In 2005 the group has been reportedly disbanded by Basayev under pressure from the Chechen separatist president Sheikh Abdul Halim , as a condition for Basayev to enter the official leadership of the separatist government . In any case it did not display any activity for more than four years after September 2004
Grozny missile attack
Grozny ballistic missile attack
Riyad-us Saliheen Brigade of Martyrs