Four women police officers are facing disciplinary action for having dyed hair, in breach of rules introduced recently by Commissioner Tsang Yam-pui. Their cases are believed to be the first under the rules that say officers' hair must be kept neat and its natural colour. The four constables were seen with brown hair by Ta Kwu Ling divisional commander Superintendent Lai Po-ting when she paid a visit to the San Uk Leng illegal immigrants holding centre on January 26. She said the women had been asked to remove the dye two weeks ago when they were briefed about the rules. Ms Lai yesterday confirmed the officers would face a disciplinary investigation. The revised rules entrust commanding officers with the responsibility for making sure their subordinates' appearance is in line with the image of the force. 'I intended to make a Lunar New Year greeting when I made the visit that day, but something unhappy turned up,' Ms Lai said. 'I did not want to take action, but as their superior I could not ignore it. 'I think there was sufficient time for them to remove the dye and they should have done it immediately after they were told.' Tony Liu Kit-ming, chairman of the Local Inspectors' Association, said he supported in principle the revised rules to maintain a proper image for the force. But he added: 'I'm just concerned about marginal cases. For example, would henna treatment be allowed? 'What if the officers just dyed one or two per cent of their hair? There should be some clarity in the enforcement.' Ms Lai said it would be taken as a sign of remorse if the officers removed the dye while the investigation was under way and it would be taken into consideration when their punishment was handed down.