ALL Sai Kung beaches have been declared dangerous after a hairdresser was mutilated in the second fatal shark attack this week. Witnesses said the water filled with blood seconds after Herman Lo Cheuk-Yuet, 29, screamed for help and was dragged underwater at the non-gazetted Sheung Sz Wan beach yesterday. The attack happened at 2.30 pm - 24 hours after the body of the first victim was pulled from the water. Yesterday's tragedy came only three hours after a shark was reported in the area. The man's right thigh was mauled to the bone before he could be pulled out of the water by two men on a sampan. The victim's friend, Lo Kwok-wai, said he heard a shout for help and saw the victim swimming towards the shore. 'I was with two other swimmers close to the shore and at first we thought he was drowning. 'We started swimming to him but when we were halfway there, someone yelled out that there was a shark and not to go out any further. 'We swam back and rowed out a boat but he was sinking and disappearing,' he said. 'He was injured seriously and I even saw bone,' he said. Mr Lo said he had heard the shark alert on the way to the beach and had decided not to go into the deep water with his friend. Another witness said: 'I saw a pool of blood behind him as he was swimming in. But no one dared to help him. 'He lost his strength and sank.' Tseung Kwan O station sergeant Chan Kwan-shing said a sampan rushed the victim to shore and into a waiting ambulance. 'When we got to the scene, the man was nearly unconscious on the beach,' he said. Officers tried in vain to revive him on the 25-minute journey to United Christian Hospital in Kwun Tong. Lo Cheuk-Yuet, had gone to the beach from his Yau Ma Tei home with his 27-year-old girlfriend, another female friend and Mr Lo Kwok-wai early in the morning. His employer had planned to join them but changed her mind. She said she had made jokes about sharks and asked them not to go. 'When I heard the news, I was very sad. I couldn't quite believe it,' the salon owner said. She criticised the Government for not sealing off the beaches after the first incident. A Regional Council spokesman said it did not see the need to raise flags after the discovery of 44-year-old Tso Kam-sun's body on Thursday because it was only a suspected shark attack. Although Sheung Sz Wan has no lifeguard or shark nets it was crowded with about 200 people during the attack. Three police motorcycles had to clear a route along Clearwater Bay Road for the ambulance as holiday-makers headed for the beaches to make the most of the Dragon Boat Festival holiday. The body of Mr Tso, a teacher, was discovered off nearby Siu Chuk Lam, near Silverstrand with his right leg bitten off. His death came two years to the day after two people were killed by sharks in Sai Kung - a 42-year-old hair salon owner was attacked at Sheung Sz Wan, and a 61-year-old man died off Silverstrand. Experts believe the same shark may be responsible. Shark warning flags were hoisted at all the eight beaches in Sai Kung - Campers, Clearwater Bay 1st and 2nd, Hap Mun Bay, Kiu Tsui, Pak Sha Chau, Silverstrand, and Trio. Government Flying Service aircraft will continue to patrol Sai Kung beaches over the weekend. A government spokesman has advised people not to swim at Sai Kung, or in the early morning or evening elsewhere, or in murky waters. All life guards on government beaches are on full alert and motor boats will be patrolling around the boomline area. At 11 am, a diver at Lung Ha Wan reported a two-metre shark but a police launch and a helicopter failed to confirm the sighting. Two hours later, 24 people were splashing in the bay, oblivious to the police line and a warning not to go into the water 'whether it is deep or shallow'. One man swam to a rock, 100 metres offshore, where he took out a picnic lunch. 'I saw the sign but it doesn't really bother me,' said Danny Wong Kit-sun, 29. 'I like to swim here and I don't think the shark is going to attack me. What is the point of being scared?' Judy Ma Tong, 32, took her three-year-old twin boys for a paddle. 'I'm not frightened. We are only along the shore, it is very shallow so I don't think the shark is going to chase us,' she laughed. 'Besides, if it started to swim near us, we would see it and run to the car.' 'What shark? There was a shark here? I didn't see a shark,' said Cindy Fan-mai, 23. 'I don't think I will swim far out today but I think it's safe to swim in the shallow water. Sharks don't come in very shallow do they?' There was another report of a sighting at Silverstrand at 6.40pm.