Investigators are calling two grass fires that broke out on the boundary of Okanagan Mountain Provincial Park this week suspicious, and are looking for witnesses who may have seen unusual activity in the area.

The fires started early Thursday afternoon southeast of Swick and Lakeshore roads in Kelowna. Together, they burned up nearly 11 hectares of land, but a team of 50 fire fighters from the Kelowna Fire Department and the Forests Ministry quickly declared the blazes under control.

By Saturday night, crews had extinguished the fires, but the area will be patrolled for a few more days in case of remaining hot spots.

The cause of the fires has not been determined, but anyone who saw suspicious activity in the area on Thursday is asked to contact police immediately.

The fires blazed through the site of a disastrous 2003 forest fire that led to the evacuation of about 50,000 people and gutted 200 homes and a lumber mill.

Fire Information Officer Michaela Swan says there have been 89 fires in the Kamloops fire district, which includes Kelowna, since April 1.

"Our 10 year average for this time of year is 219, so we're still well below average," Swan said.

No evacuation orders were given during the latest fire, though two property owners left voluntarily.

Lightning sparks new blaze near Spences Bridge

Crews are currently at work near Spences Bridge, located southwest of Kamloops, battling a new 25-hectare fire that authorities believe was sparked by lightning on Friday night.

The fire isn't immediately threatening any homes, but it is putting area residents on edge. "It concerns us because everything's so dry around here now," Grant Nieborn said.

Swan says there are 41 fire fighters on site assisted by five helicopters, but the terrain is making containment difficult.

"This fire's on very steep slopes," she said. "If we can make good progress today at getting a guard around this fire, we're hoping to hold it after today's burning period."

The fire fighting resources diverted from B.C. to Ontario and Quebec earlier this year are also back, Swan added, and ready for action.

"We're here, we're ready in case of need," she said.

With a report from CTV British Columbia's Kent Molgat