ATHENS (Reuters) - Greece declared a state of emergency on Friday in its northern region of Evros and asked the EU for help to battle a major forest fire which raged unabated for a third day. The blaze near the border with Turkey forced the evacuation of two villages and could threaten a national park with rare birds and vegetation, but there have been no reports of injuries, officials said. "The fire is in full progress, it's a quite difficult situation. A state of emergency has been declared," a fire brigade official said. Greece has asked its EU partners for six firefighting airplanes and is expecting to receive two from France and two more from Spain later on Friday.