Two 13-year-old girls were in critical condition in Queen Elizabeth Hospital last night after they jumped more than 10 metres from a building in Wong Tai Sin in what police say was an attempt at suicide. The teenagers were found semi-conscious outside a block in Chuk Yuen South Estate shortly after 5.30pm. The girls initially told police they had fallen accidentally from the podium on to the street while playing on the ledge. But they later admitted they had tried to kill themselves. Police said the girls had also swallowed more than 10 pills between them before the incident. Their conditions deteriorated last night and they were admitted to the intensive care ward of Queen Elizabeth Hospital with serious chest and back injuries. Reasons for the girls' action were not immediately known, but police suspect it was related to poor school performances. However, one girl's mother said she could not believe her daughter wanted to kill herself because of poor grades. She admitted that she had scolded her about poor school results the day before, but had comforted her later. 'I made sure she was all right,' she insisted, adding she had given her daughter $100 when she left home at 8am yesterday saying she was going to a classmate's house to study. The woman said she was shocked when police contacted her and told her that her daughter had attempted to kill herself with another girl. The girls are classmates at a school in San Po Kong. Residents of the estate told police officers that the two girls had been seen wandering around the podium for hours before the incident.