ISLAMABAD , Pakistan ( CNN ) -- A radical cleric imprisoned for his role in a deadly Pakistan mosque siege has vowed to continue his campaign to impose hardline Islamic law in his first sermon since being released . Maulana Abdul Aziz gave his first sermon since being released from house arrest . Maulana Abdul Aziz was freed on Thursday -- nearly two years after siege at Islamabad 's Red Mosque that left 90 people dead , including Aziz 's son and brother . Addressing Friday prayers in the battle-scarred mosque , Aziz said he was willing to see more blood spilled for his cause . `` My only son was killed for this great mission of Islam , '' he told a capacity crowd at the mosque . `` If I had 100 sons , I would ask them to die for Islam . '' Aziz was arrested after the Pakistani government laid siege to the mosque in July 2007 to crack down on its efforts to promote Taliban-style sharia law . He was seized while trying to sneak away disguised with a women 's burqa . He was held under house arrest until Pakistan 's Supreme Court allowed his release late Thursday . It was the latest in a series of concessions by the government of President Asif Ali Zardari to Islamist militants . During Friday 's sermon , Aziz argued that his supporters ' fierce resistance during the siege , helped lead to a recent peace deal between the Pakistani government and Taliban militants in Pakistan 's northwestern Swat Valley . This week , Zardari signed an agreement , allowing Taliban fighters to implement sharia law in Swat . In an interview with CNN , Aziz 's spokesman Mohammed Amir Siddique said the cleric had no direct ties with the Taliban , but added `` We support them morally . '' Aziz 's sermon coincided with new international efforts to help combat extremism in Pakistan , seen as key to regional stability -- particularly in neighboring Afghanistan . At an international donors conference in Tokyo , countries including the United States and Saudi Arabia reportedly offered a total of $ 5 billion in aid to help boost economic development and improve security .
Sheikh Maulana Abdul Aziz was freed from house arrest on Thursday . Aziz was held for his role in the mosque siege . Aziz 's spokesman says he supports the Taliban .