Two Cable TV journalists said they were attacked and injured by two mainlanders as they investigated suspected illegal freshwater fish exports from Zhuhai to Hong Kong. Reporter Chris Lam Kin-seng and cameraman Lo Chun-Wai suffered slight injuries, with Lo receiving hospital treatment in Zhongshan . One suspect was arrested and was in custody last night. The Hong Kong Economic and Trade Office in Guangdong voiced concern over the incident last night and said the case had been handed to local police. Two senior staff members from Cable TV went to Guangzhou after the attack. Lam and Lo had arrived at the Huangsha seafood market in Guangzhou at around 5pm. They were following two trucks carrying boxes of freshwater fish from Guangzhou to Zhuhai, believed to be destined for Hong Kong. They said two men in the trucks became angry after discovering they were being followed in Xiangzhou port, Zhuhai. 'They yelled at us, asking why we followed them and wanted our identification,' said Lam. 'The two men then attacked us. One of them shouted: 'Do you know I can kill you?'' Lam said the two men, in their 40s, hit them with their fists and then picked up some stones and hit them again, on their heads. 'I was bigger and taller than Ah Wai [Lo], and I dodged. They couldn't do much to me so they focused on him. One of them grabbed him, while the other one hit him hard,' said Lam. He said a third man then got out of a car and watched the brawl. Lam managed to stop a passing police vehicle, while Lo caught one of the suspects, who was arrested. The second suspect escaped. 'I'm fine. All the wounds are mostly superficial,' said Lo after an X-ray. Lam said: 'My condition is fine. I'm just worried about my co-worker.' Lam was still helping officers with the investigation at a police station in Xiangzhou last night.