The driver of a school bus that dragged an 11-year-old boy 20 metres to his death yesterday was arrested for dangerous driving causing death. Police said Wong Ho-see, a Primary Six pupil at Po Leung Kuk Choi Kai Yau School in Cheung Sha Wan, might have survived if the driver of the American International School bus had braked earlier. The 24-seater dragged the boy for 20 metres before the 31-year-old driver braked, leaving a metre-long skid mark, police said. 'We are investigating why the driver did not make a crash stop at the moment the bus hit him or earlier,' an officer said. But police also said investigations showed the boy was crossing on a red pedestrian light. The boy's backpack was caught by the front of the bus and he was trapped under the left front wheel. The driver, who has had a licence to drive 24-seat buses for about a year, was released on bail of HK$5,000. She must report back to police in November. The accident happened about 15 minutes after Ho-see missed his own school bus at Rambler Crest on Tsing Yi Road at about 7am. Police believe that after he missed the bus, the boy went by minibus or taxi to another stop on Tsing King Road outside Tivoli Garden to catch it. As he was crossing the road outside Tivoli Garden, he was hit by the bus on the pedestrian crossing. He was freed by firemen and taken to Princess Margaret Hospital, where doctors declared him dead at 7.41am. The accident happened minutes before the Po Leung Kuk Choi Kai Yau School bus arrived at Tivoli Garden. The school said it was saddened by the incident and had sent condolences to the boy's family. 'As police are investigating the case, it is inappropriate to make any comment,' the school said in a statement.