A police union says it will fight for more resources to change the system that requires frontline officers to patrol the streets alone, in the aftermath of yesterday's attack. Junior Police Officers' Association vice-chairman Chung Kam-wa said patrolling the streets alone posed a high risk to frontline officers, although there was a standard safety procedure on how to carry out a routine stop and search. 'It is impossible for officers to forecast whether someone they stop and search in the street is a dangerous or violent person. Yesterday's attack is an isolated case but it reflects that our work is dangerous,' he said. Mr Chung said officers were under pressure since recruitment dropped sharply as part of the government's cost-cutting. 'A heavy workload and stress could affect alertness,' he said. The union said it would continue to demand more resources and manpower from the Security Bureau and civil service branch. Under the current system, frontline officers generally patrol alone in the day and in pairs at night.