 Meanwhile, fighters of Bin Laden's Brigade 055 were known for committing collective suicide before running risk of being taken prisoners by enemy forces themselves.The Islamic Movement of Uzbekistan (IMU) is a militant group formed in 1991 with strong ties to Al Qaeda.It is estimated that the IMU in the late 1990s was approximately 2000 men strong, and that they contributed around 600 fighters to the Taliban's offensive against Massoud, participating in the siege of Taloqan, where they fought alongside Bin Laden's 055 Brigade.