A firefighter walks through the charred remains of a Praktiker retail store that caught on fire in in Pylaia, Thessaloniki, yesterday. The blaze in the 12,000-square-meter store started in the early morning hours and quickly spread due to the flammable materials in stock in the store. Residents in the area were warned to protect themselves against the toxic smoke given off by the blaze. There were no reports of injuries. An investigation into the cause of the fire has been launched.