Australian authorities released footage of former nurse Roger Dean telling police he deliberately lit two fires that killed 11 people at a nursing home in Sydney, Australia.

Police said Dean, whose trial started this week, admitted to lighting a hospital bed on November 18, 2011.

"I used a cigarette lighter and I lit and empty bed," Dean told police. Dean was referring to the first of two fires that he lit in an unoccupied room. While residents were being evacuated, Dean is seen going to light the second fire in another room that was occupied at the time.

The second fire spread into the roof of the nursing home and was difficult for fire-fighters to extinguish.

"I didn't expect to light a bed, I just wanted to light something," said Dean.

The fire destroyed the Quakers Hill nursing home with over 80 residents inside at the time.

Australia's ABC reported Dean as saying during his interview that he loved the residents but couldn't turn back time.

During the police interview, Dean said he had evil thoughts.

"I just felt evil, that I'm just corrupted with evil thoughts that have made me do that," said Dean.

"It was like Satan was saying to me that it's the right thing to do," he added.

Dean pleaded guilty on Monday (May 27) in the New South Wales Supreme Court to 11 counts of murder on the first day of the trial, which is expected to last weeks.

Some of the victims died during the fire, others died later due to their injuries.

The law in New South Wales was changed after the fire to make it compulsory for nursing homes in the state to have water sprinklers, local media reported.

Presented by Adam Justice