A knife attack in the Gare de Lyon rail station in Paris left three people wounded, police said, ruling out terrorism at this stage. Police arrested the suspected attacker, who showed signs of mental disorders, Paris police chief Laurent Nunes told reporters. "We found medicine on him which suggests he was undergoing treatment." Two of the victims suffered light wounds while the third was more seriously hurt but was not in a life-threatening situation, police said. The attacker, who carried Italian residence permits and was in France legally, attacked travellers with a knife and hammer. French media said he was…