An arrest warrant has been issued for a man who sparked a four-hour siege at Perth's Kings Park while holding his elderly father hostage in a car and threatening police.
David Charles Batty failed to appear in Perth's District Court on Tuesday on three charges including attempting to cause an explosion likely to do serious damage to property and deprivation of liberty.
The matter was listed for sentencing.
Batty's defence lawyer told the court that staff at Graylands Hospital, where he was being detained since the incident last year, hadn't seen him for a week.
In July 2013, police closed down part of King's Park after they became aware that Batty, who was parked in a Hyundai hatchback, was in an agitated state and allegedly holding a barbecue gas bottle and a cigarette lighter.
After attempting to negotiate with him for four-and-a-half hours, Tactical Response Group vehicles rammed Batty's car into a garden bed when he started driving away.
Non-lethal bean bag rounds were fired at his vehicle during the short pursuit.
Police also claimed his elderly father Frank, then aged 79, was a hostage in the car, with his wrists bound by tape, but he escaped from the vehicle before police arrived.
Following his arrest, the Perth Magistrates Court heard that Graylands Hospital's maximum-security Frankland Centre had submitted a report on Batty, saying he still required psychiatric care and was not fit to stand trial.