The government of President Goodluck Jonathan used legal tools as well as brutal means to clamp down on media coverage deemed critical of the government. Sensitive and dangerous topics for the press included coverage of high-level public corruption, the government's war against Boko Haram insurgents, and the political activities of the Jonathan administration. Regulatory agencies headed by Jonathan-appointed officials cracked down on radio commentary critical of the government, and banned a radio station in connection with its criticism of an official polio immunization campaign. Film regulators also banned an acclaimed documentary detailing a culture of impunity for public corruption. The administration criminally charged the independent newspaper Leadership over the publication of a memo allegedly written by the president on plans to increase gas prices and sabotage a merger of opposition political parties. Amid continuing military action against insurgents in the north, security forces also harassed a newspaper in connection with its investigative report on alleged extrajudicial detentions of terrorism suspects. The government amended the anti-terrorism law to include broadly defined offenses that criminalize some legitimate newsgathering activities, according to news reports. Nigeria appeared for the first time on CPJ's Impunity Index, which highlights countries where journalists are murdered regularly and killers go free.