The man charged in a hostage-taking at the downtown office of the Workers' Compensation Board two years ago has pleaded guilty to several weapons related charges.

Patrick Clayton was facing a total of 18 charges, and on Monday, he pleaded guilty to three of them.

Clayton pleaded guilty to pointing a firearm, use of a firearm to take hostages, and having a prohibited weapon in his possession.

The charges stem from a ten-hour standoff with police at the WCB building in October 2009.

Clayton was charged with nine counts of unlawful confinement, six counts of pointing a firearm, possession of an offensive weapon dangerous to the public, careless use or storage of a firearm and use of a firearm during the commission of an offence.

"The Crown will definitely be seeking a significant period of incarceration," Crown Prosecutor Lisa Tchir said.

Tchir also mentioned at least nine victim impact statements will be read during Clayton's sentencing hearing.

The four day sentencing hearing is set to begin next week.

With files from David Ewasuk