Six legislators and activists from Citizens' Radio were back on the air last night despite a court injunction, risking charges of unlicensed broadcasting and contempt of court. Programme organisers and guests launched a talk show on FM 102.8 from a pedestrian zone in Mong Kok at 7.20pm, three hours after the Court of First Instance made a temporary order prohibiting the station from broadcasting until next Friday. Mr Justice Barnabas Fung Wah ruled that it was in the public interest to continue the suspension of a lower court's earlier ruling that the broadcast licensing system was unconstitutional, because unlicensed broadcasting could interfere with the telecommunications channels used by emergency and aviation services. The one-hour talk show, with the theme of urging people to join Sunday's march for universal suffrage in 2012, ran without interruption. The hosts' booth was surrounded by dozens of passers-by. No uniformed police could be seen but officials distributed copies of the injunction to the participants. The Office of the Telecommunications Authority said it had launched an investigation into last night's transmission. A spokesman said the authority would also prosecute offenders under the Telecommunications Ordinance if there was sufficient evidence. Among the speakers were the station's convenor, Tsang Kin-shing, and legislator Leung Kwok-hung, who were named in the injunction. They and three others, charged with illegal broadcasting over earlier operations of Citizens' Radio, mounted a constitutional challenge to the Telecommunications Ordinance that led to the ruling by Magistrate Douglas Yau Tak-hong, which he suspended until the prosecution's appeal has been heard in a higher court. The case took its latest twist on Wednesday evening when the government sought an urgent court order to stop the station from broadcasting. Contempt of court carries a penalty of up to six months' jail, while individuals involved in unlicensed broadcasting may be jailed for up to two years and fined HK$50,000. Legislator Emily Lau Wai-hing, one of the guests on last night's programme, said: 'If we are sentenced to jail, we will go to jail.' Other lawmakers who spoke on the show were Albert Chan Wai-yip, Fernando Cheung Chiu-hung, Lee Cheuk-yan and Lee Wing-tat. Commerce secretary Frederick Ma Si-hang said the injunction had been sought to protect the public interest, and warned the station and participants to comply with the order. 'The government has to enforce the law against any deliberate attempt to flout the law' he said.