A wildfire blazing just west of Lytton, B.C., has now scorched five square kilometres of trees and bush, more than doubling in size in less than 12 hours.

BC Wildfire Service spokeswoman Taylor Colman says the out-of-control fire is burning vigorously and is being fuelled by gusty winds just under two kilometres northwest of Lytton.

Several evacuation orders and alerts have been issued by the Thompson-Nicola Regional District and the Lytton First Nation for properties on the west side of the Fraser River, across the water from Lytton.

The regional district is still working to confirm reports that three buildings were lost in the hours after the flames broke out.

Colman says the fire was sparked just after noon Thursday and reaching it is a challenge because there are few roads in the area and the tiny ferry that crosses the Fraser River at Lytton is out of service due to high water levels.

She says three 20-person crews have now been assigned to the fire and will be supported by helicopters through the day as the fire continues to work its way north, away from Lytton.