The South Sudan Media Authority has banned at least 20 foreign journalists for what it termed as "unsubstantiated and unrealistic stories."
Journalists claim to have been kept from looking at president's compound by security agents.
Lungu is a recent addition to the list of state leaders clamping down on press freedom across the world.
Amnesty International has criticised President Robert Mugabe's government over its failure to account for Itai Dzamara's disappearance.
Bujumbura has cracked down on the press, forcing independent media to shut down and driving some journalists into exile
Uganda's arrival present for pope; Parliament passes bills that rights groups say 'strangles' criticism
Uganda previously passed tough anti-homosexuality legislation and gay rights activists fear they will be the target of the controversial NGO bill
It's not clear if ransom was paid. Kidnapping for money is common in Nigeria’s southern oil producing regions, where many criminal gangs operate.
East Africans most supportive of free press. And in post-authoritarian African countries, the media shouldn't expect much from the public.
Less than 1% of the Eritrean population goes online. If you want the ultimate master class in controlling information, head to Asmara.
Satirical cartoonists who dare speak truth to Africa's power; from Gado, 'Z', Papo, Doaa El Adl, Tayo, Zapiro...
From the well-known, to the less so, these cartoonists add a special spice to media coverage
Dozens of people, mostly journalists and many in tears, gathered outside the headquarters of the journalists' union in Tunis to wait for news.
500 "witches" are killed every year in Tanzania. Some are targeted simply because they have red eyes.