Asylum seekers have rioted at an Australian detention centre in Sydney and set on fire many buildings.<br /><br />Some of the detainees at Villawood centre also got onto the roof to unfurl banners and attacked firefighters and guards.<br /><br />Rights groups said the long delays in the immigration applications process might have precipitated the violence.<br /><br />But politicians condemned the actions as the "criminal behaviour" of people "not welcome" in Australia.<br /><br />Al Jazeera's Andrew Thomas reports from Sydney.<br />About 100 detainees were involved in the protest at Sydney's Villawood centre.<br /><br />Buildings were set alight and some detainees got onto the roof to unfurl banners and attack firefighters and guards.<br /><br />Refugee groups say the time it takes to process applications is behind the violence<br /><br />But politicians condemned the actions as the "criminal behaviour" of people "not welcome" in Australia.
