No more tear-gas drills are planned for the Castle Peak firing range after an exercise this week was thought to have left 42 children ill and caused thousands of people to be evacuated.
The police are to review their tear-gas training and the use of the range for drills while the Correctional Services Department said it had no plans for any more exercises there.
Government chemists were yesterday analysing gas samples and collecting information from the two forces, whose members fired a total 843 rounds of gas at Pak Nai on Wednesday.
The range is seven kilometres from Tin Shui Wai, where 42 school pupils and a 50-year-old man became ill after inhaling a mystery gas. Another 10,000 people were evacuated from the area.
The government laboratory's senior chemist, Au Yeung Chi-yuen, said four gas bags were collected.
'We are working on some hypotheses on the types of gas,' he said.
