Hong Kong firefighters forced their way into a Happy Valley flat late last night where three mainland Falun Gong practitioners were threatening to jump from the 10th floor after immigration officers tried to arrest them for overstaying. The standoff began at 9.30am with police negotiating from outside. At 11.30pm Fire Services Department officers broke into the flat and along with immigration officials began negotiations with the practitioners inside. Relatives of the three people were brought to the flat and promised to take them to the Immigration Department on Monday. The trio - two men and a woman aged between 28 and 31 - want their stay extended for three months. Another four Falun Gong members including a six-year-old girl, whose visitors' permits had expired, were arrested in the same building in Sing Woo Road yesterday morning. All seven people - three males and four females aged between 6 and 47 - hold mainland passports. The Immigration Department claimed the operation was not aimed at cracking down on the religious group but was a routine check on over-stayers. One of the practitioners said a group of about 10 sect members arrived in the SAR to attend the Hong Kong Book Fair at the Convention Centre, which started on Wednesday. A woman who claimed to be a Falun Gong practitioner said her fellow believers were reluctant to extend their stay earlier because they worried that their application would be rejected by the Immigration Department. But Falun Gong's SAR branch spokesman, Kan Hung-cheung, said he did not know any of the sect members arrested yesterday.