BNP Chairperson Khaleda Zia yesterday filed a writ petition with the High Court, challenging the legality of the government notification that says the Niko corruption case trial against her will be held at a special court inside Keraniganj Central Jail instead of a Dhaka court. On May 13, the law ministry issued the gazette notification, saying that trials of 17 criminal cases, including the Niko, against Khaleda would be held at a special court set up at building-2 of Keraniganj Central Jail for security reasons.