A similar aerial attack on a large column of refugees fleeing Grozny fighting took place in August 1996 . A number of other attacks on " humanitarian corridor " refugee convoys and foot columns were also reported later in 1999-2000 , including a December 3 incident in which about 40 people were shot to death at a Russian police checkpoint . In 2008 a suspected mass grave of some 300 persons was uncovered near Grozny , likely containing remains of victims of an artillery attack on a " green corridor " in October 1999
a December 3 incident
1999 Grozny refugee convoy shooting
Baku–Rostov highway bombing