WINSTON-SALEM—The Winston-Salem Fire Department continues its investigation of a fuel mix-up at a Twin City gas station.

Firefighters say the incident sparked two house fires.

Investigators are putting out a statewide alert, hoping to find the other customers affected before another potentially explosive situation happens.

“I had the kerosene heater right here, and it started smoking and caught on fire,” said one of the homeowners affected.

It burned a big chunk of carpet at his house on Lansing Drive.

Fortunately, no one there was hurt.

It all started when the people who live there thought they'd bought kerosene at the Akron Market, but it was actually gas.

"There were six purchases, a total of approximately 30 gallons,” said Division Chief Sandy Shepherd with the Winston-Salem Fire Department.

The same thing happened at a home on Doris Street.

"One of the occupants of the home had minor burns and smoke inhalation because of the close proximity,” Shepherd said.

Investigators say they've tracked down a third customer, but are looking for three others.

"It's very important because the situation could be much worse than what we saw with these two cases,” Shepherd said.

While the store owner didn't want to go on camera, he said he wants to assure customers that all lines have been cleared, and that they're safe to use now.

Petroleum Transport Company’s driver made the mistake. Chief Operating Officer Jay Boaz released a statement saying:

"Once we learned the threat existed of a possible issue, we quickly got our safety team involved. We took all the necessary steps to secure the site and remove any possible contaminated product. At this point it looks like there was minimal product sold and only a handful of transactions made. We will continue to monitor the situation."

"Everything we've seen so far is an accident,” Shepherd said.

Investigators believe this was an isolated incident and only happened at this station.

The fuel was delivered the morning of Jan. 2.

“Sometimes gasoline is clear, a lot of times, the kerosene has a red tint to it,” said Division Chief Jeff Heitman with the Winston-Salem Fire Department. “So from a visual standpoint, you should be able to tell the difference. The aroma is also different."

If you suspect you're affected by the fuel mix-up, the fire department asks you to call 911, and they'll send an investigator to check things out.