By fall 2003 these insurgent groups began using typical guerrilla tactics: ambushes, bombings, kidnappings, sniper attacks and the use of IEDs.Other actions include mortars and suicide attacks, explosively formed penetrators, small arms fire, anti-aircraft missiles (SA-7, SA-14, SA-16) and RPGs.[9][10] Insurgent groups such as the al-Abud Network have also attempted to constitute their own chemical weapons programs, trying to weaponise traditional mortar rounds with ricin and mustard toxin.[11] There is evidence that some guerrilla groups are organised on a large scale, most likely by the Fedayeen Saddam, Ba'ath loyalists, religious radicals and nationalist Iraqis that are angered by the occupation.This violent break between Muqtada al-Sadr's Mahdi Army and the rival Badr Organization of Abdul Aziz al-Hakim, seen in the fighting in the town of Amarah on October 20, 2006, would severely complicate the efforts of Iraqi and US officials to quell the soaring violence.