'Bomb in backpack': man sentenced over Sydney siege

A man who was with his 12-year-old daughter during an 11-hour siege at a lawyer's Sydney office has been jailed for at least seven months and six days.

But that period expired last week, due to him being in custody since arrest, and he is now on a two-year good behaviour bond, which involves continuing psychiatric treatment.

The 53-year-old man from Orange, in NSW's central west, pleaded guilty in February to threatening injury to property with the intent to prevent lawful detention and to giving false information to police.

The NSW District Court was told the incident occurred at Arthur Phillips Chambers in Parramatta from 8.50am until 8.20pm on September 6 last year.

Police said the man, who cannot be named for legal reasons, made false threats about having a bomb in a backpack.

Judge Kevin Coorey sentenced him to imprisonment of two years, seven months and six days, with a non-parole period of seven months and six days.

The non-parole period expired last week.

His parole conditions include continuing under the care of the Orange Community Mental Health Team, complying with medication set by his psychiatrist and engaging in "proper work or study".