09/19/2013 03:47 EDT | Updated 11/19/2013 05:12 EST

Police say suspicious fire damaged historic city hall in Grand Forks, B.C.

GRAND FORKS, B.C. - Damage to the historic city hall in Grand Forks, B.C., is believed to be extensive following an early-morning fire.

The first floor of the two-storey brick structure was already on in flames when crews arrived after 5:30 a.m.

RCMP say the cause appears to be suspicious and have a person of interest in custody.

Arson investigators are on scene and structural engineers are being consulted to determine if the building is safe to enter.

It's the second major fire to hit the community in recent years.

In March 2012, the Grand Forks Hotel burned to the ground after it was set on fire. (CKIZ, CHBC-Global)