According to a Japanese newspaper account, at a rate of 65%, handicapped persons left crippled by land mines or unexploded shells are recruited by the Taliban as suicide bombers, according to Rusuf Radgari, an associate professor at Kabul University's medical faculty. Radgari added: "These people are missing limbs, in poverty and unable to work, and there's the possibility that they are agreeing (to carry out these attacks) in exchange for a livelihood for their families."
Suicide attacks against foreign military and government targets in Afghanistan have increased dramatically over the past few years. A U.N. study showed that while there were only 17 cases in 2005, this figure shot up to 123 in 2006 and 150 in 2007.
Cf. http://mainichi.jp/select/world/news/20081020k0000m030105000c.html