Moroccan singer Dounia Batma was heard, Monday, by the King's prosecutor in Marrakech and then brought before the investigating judge over alleged involvement in blackmail. The Bahrain-based singer is reportedly prosecuted over «blackmail and defamation» allegations, Alarabiya reports. According to media reports, Dounia's sister Ibtissam Batma has been arrested by the police over the same claims. Last week, Dounia Batma, who rose to fame as the runner-up of the first season of Arab Idol, had her passport and cell phone seized by the police as soon as she arrived in Morocco, Le360 reported. On Thursday, she was interrogated for 12 hours by the National Brigade of the Judicial Police (BNPJ) in Casablanca as part of an investigation into the «Hamza mon bb» case. «She was also formally notified that she is banned from leaving the country», well-informed sources said. The «Hamza mon bb» case emerged in August when Moroccan singer Saida Charaf filed a complaint against an anonymous account on social media. This account released intimate details about the private lives of several Moroccan celebrities. On September 16, the main owner of the account was arrested and then brought before the Marrakech Court of First Instance. He was charged with «defamation, insult, bashing, sexual harassment and violation of the privacy of several people on the Internet». One of the people related case revealed that the Batma sisters were allegedly involved in the case.