Fire investigators are still trying to determine what caused an Issaquah apartment clubhouse to catch fire Tuesday.

While the structure wasn’t consumed in flames, it got hot enough inside that it melted plastic vent coverings on the roof, according to an Eastside Fire and Rescue press release.

Smoke heavily damaged the building, located at 145 Newport Way NW, but the fire was oxygen deprived and had almost burned itself out by time firefighters arrived.

Originally, the incident was reported as a gas leak, but the fire crews discovered the smell was actually caused by the fire, and there was no gas leak.