At least 20 houses have been gutted in a devastating fire that broke out at Fatullah in Narayanganj district early on Friday.The affected house owners claimed to have suffered a loss of about Tk8 lakhs in the fire.Narayanganj Fire Service and Civil Defence DAD Momtazuddin Ahmed said two units from the fire service went to the spot and brought the blaze under control around 2am.The fire originated from a tin-shed house at Bilash Nogor area around 1:30am and soon engulfed the nearby houses.