Zimbabwe's security minister was quoted Friday in a government-controlled newspaper as saying that "the net will soon close" on those remaining journalists whose criticism of the government threatens the nation's security. The warning from the official, Didymus Mutasa, followed the arrest this month of employees and directors of Voice of the People, a news organization based in the capital, Harare, that had broadcast uncensored reports into Zimbabwe via a shortwave transmitter in Madagascar operated by the Dutch government.