A fire that destroyed Troutdale restaurant Shirley’s Tippy Canoe has been deemed suspicious, investigators said . Corbett Fire District 14 said Thursday that the fire that destroyed the restaurant on Jan. 17 remains under investigation and that the cause has yet to be determined, The Oregonian/OregonLive reported. “We are currently calling the fire suspicious in nature due to several unusual circumstances that occurred in the days and hours leading up to the fire,” officials said in a news release. Fire district officials said they would not disclose the circumstances but said they would continue working to determine the fire's cause. Firefighters responded to the scene around 5 a.m. and found the entire second floor of the restaurant ablaze. The first floor had high heat and heavy smoke damage. Investigators said they believe the losses total more than $1 million. The restaurant was a total loss.