ALMOST 10 per cent of ambulances are failing to arrive within their target time of 10 minutes, according to new figures. Between January and March this year, the Government's 10-minute target was achieved for 93 per cent of emergency calls on Hong Kong Island, 90 per cent for Kowloon and 88 per cent in the New Territories. Performance was much worse during the day than at night. The findings were included in a report by British consultant Operational Research in Health Limited which recommended strengthening services. It found that emergency and urgent demand levels were now 40 per cent higher than in 1986 when the last study was done. On average there were 964 emergency calls a day in the territory last year. Recommendations to achieve the ambulance target include redeploying existing resources, better located ambulance depots and using fire stations for standby cover. Yesterday, in response, the Security Branch told the Legislative Council in a paper that the provision of an extra 31 ambulances and crew and 10 ambulance aid motorcycles would be considered. The extra services are identified as necessary to meet the 95 per cent performance target.