After the disastrous storm that battered Hong Kong in September 1906 and resulted in over 10,000 deaths, a small committee consisting of the harbour master, a nominee of the commodore and a nominee of the Chamber of Commerce was set up to review the need to improve storm warning system for the local public. Based on the suggestions by the committee, the typhoon gun, which had been used to warn of a strong gale of wind since 1884, was abolished in 1907. Its place was taken up by the urgent signal of firing three explosive bombs at the Water Police Station in Tsim Sha Tsui, at intervals of ten seconds when the winds were expected to increase to full hurricane force. This was repeated at the Harbour Office. A Black Cross was also hoisted at the same time, superior to other shapes (that is above all the non-local signals), to indicate winds of hurricane force. Moreover, the night signals were re-organised with three vertical lights in green and red. The new night signals, mounted on the roof of the Water Police Station at Tsim Sha Tsui, were repeated at the Harbour Office and on board H.M.S. Tamar and thus was visible in all parts of the harbour. In addition, Supplementary Warnings in the form of a cone would be hoisted at nine outlying stations such as Waglan Island, Gap Rock and Aberdeen to inform passers-by that storm signals were hoisted in the harbour. The night signals were transferred from the Water Police Station to the Kowloon Railway Station in 1916.