Hezbollah reportedly used 500 to over one thousand ATGMs in the 2006 war and has thousands in total. According to an American think tank, Hezbollah used its ATGMs with "tactical skill" and few technical errors. Hezbollah's use of anti-tank weaponry is often considered to be very successful, with the group using anti-tank weapons to "swarm" Israeli tanks, target massed infantry, and target buildings. Most Israeli casualties in the 2006 war were caused by anti-tank weapons. In addition to the quantities listed above, Hezbollah has received many unreported weapons shipments from Iran and Syria.