According to International Crisis Group, it was after this stint with the terror organisation that he went back to Somalia in 2003 to set up a network with other al-Itihaad al-Islamiya veterans to assassinate foreigners and opponents, culminating in the eventual deaths of four foreign aid workers and at least ten Somali former military and police officers. On June 10, 2006, The Guardian repeated this story by stating, "An unnamed network run by one of Aweys's proteges, Aden Hashi Farah "Ayro", has been linked to the murder of four western aid workers and more than a dozen Somalis who allegedly cooperated with counter-terror organisations." They also desecrated an Italian cemetery in Mogadishu to great international outrage, and helped shelter and provide assistance to Al-Qaeda operatives in Banaadir and the Lower Shabelle region of Somalia. During this period, Ayro's actions remained clandestine. (see page 8)
On June 15, 2006, Aden Hashi Farah "Eyrow" was said to have taken a load of arms sent from Eritrea (see page 12).
In July, 720 Somali volunteers were selected by Aden Hashi Farah "Eyrow" to travel to Lebanon to fight against the Israelis. Of those, only 80 returned to Mogadishu. In September, another 20 returned, along with five members of Hizbollah. (see page 24).
He was placed in charge of the Shabaab by Hassan Dahir Aweys, but an October 2006 article in The Economist indicated Aweys may have had some regrets regarding the appointment.
The bankruptcy of a remittance company, Dalsan, International, whose staff included the brother of Aden Hashi Farah "Eyrow", involved the suspicious disappearance of $10 million dollars. It was alleged, "an ICU military leader managed to divert a large amount of money to help financially support the organization in their fight for the control of Mogadishu during the June 2006 confrontation with the former counter terrorism alliance" (see page 39). (Also see ARPCT, Second Battle of Mogadishu)
During Ethiopia's invasion of Somalia to oust the Islamic Courts Union militia from power, sources claimed by SomaliNet news that Aden led an elite-commando arm which caused stiff-resistance in the Baidoa region, despite ICU forces beginning to retreat from fronts elsewhere.
However, on March 7, 2007, it was found that Aden Hashi Ayro, who has described himself as a commander of the Islamic Courts movement, said in an audio tape sent to Mogadishu-based Koran Radio: "It is time for the Somali youth to fight the occupation by Ethiopia and others." He further said, "We will fight for the name of God and our country. Let us bring together all our forces to fight the enemy of Somalia.".